Fix Firefox Connection Reset Error

Fix Firefox Connection Reset Error

Firefox is one of the most preferred privacy-centric browsers used by internet surfers worldwide. It supports various Web standards like HTML, XML, XHTML, CSS (with extensions), JavaScript, DOM, MathML, SVG, XSLT, and XPath. Yet, several users face PR_CONNECT_RESET_ERROR Firefox while browsing the internet. PR_CONNECT_RESET_ERROR occurs when your PC successfully attained its search results from the server site but could not process them completely. If you face the same issue, you are not alone! In this guide, you can learn the troubleshooting methods to fix Firefox connection reset error. Here we go!

Fix Firefox Connection Reset Error

How to Fix Firefox Connection Reset Error

Here are some possible reasons that may cause SSL_ERROR_NO_CYPHER_OVERLAP error on Firefox. Analyzing the factors that trigger the error will help you follow the troubleshooting methods accordingly.

  • If you have enabled TCP protocol filtering in your Antivirus settings, the connection between the end-user and the webserver will be interrupted more often. This happens in the ESET antivirus program.
  • Certain temporary browser cache may interfere with new webserver connections leading to this error on Firefox.
  • When your antivirus/Windows Defender Firewall is overprotective, interruptions between the end-user and the webserver will lead to this error.
  • If you are using a VPN or Proxy server, your web server might face the said problem due to security precautions configured to it.
  • Some restricted networks might prevent you from accessing any particular web server, causing this error on Firefox.
  • An outdated version of the browser, problematic browser extensions, or misconfigured network settings may also cause this error.

One of the best-known features of Firefox is its open-source feature that enables users worldwide to write code and extend the functionality of the browser in terms of add-ons, themes, and extensions. It guarantees online piracy and, as per the December 2021 record, stands fourth in the list of most popular desktop browsers after Google Chrome, Safari, and Microsoft Edge.

This section has compiled a list of troubleshooting methods to fix this error on Firefox. The methods are arranged according to the impact level from basic to advanced. Follow the methods in the same order and check if you have fixed the issue.

Preliminary Checks

The primary troubleshooting step to fix Firefox connection reset error is to ensure that you have a stable network connection. If you have network instability, you will face an error on any website you access. Therefore, whenever you encounter this error on Firefox, open a new tab and search for another website. If you face the error in all the websites you access in the browser, this indicates your network connection is not stable. Ensure the network speed and bandwidth to fix it. Here are a few more preliminary steps you can follow to fix this error.

  • If you use an old, damaged, or unreliable cable, the internet connection will keep disconnecting from the device. Even if your internet speed is very high, you will not get uninterrupted service when the wires are broken. Check if the connecting cables are up to the mark.
  • If you have any network conflicts, you can fix them by restarting the router. However, restarting the router will re-initiate the network connectivity. Few users have reported that all the changes marked in the configuration settings will be effective in action when you restart the router. Therefore, follow the below-mentioned steps to restart your router.

1. Find the Power button at the back of your router.

2. Press the button once to turn it off.

Find the ON OFF button at the back of your router | How to Fix PR_CONNECT_RESET_ERROR in Mozilla Firefox

3. Now, disconnect your Router power cable and wait until the power is entirely drained from the capacitors.

4. Then, reconnect the power cable and switch it on after a minute. 

5. Wait until the network connection is re-established and try signing in again.

If you face the error only on one particular website, there is no issue with the internet connection, and you can follow the troubleshooting methods discussed here to fix them.

Method 1: Clear Firefox Browser Cache

Temporary files like corrupt browser cache might cause interruptions in the end-user and the web server connection. This may lead to this error on Firefox when you surf the internet. Try clearing the browser cache and check if you have fixed Firefox connection reset error. Follow the below steps.

1. Launch the Firefox browser.

2. Now, click on the menu icon as highlighted in the pic below.

Now, click on the Menu icon at the top right corner of the screen

3. Here, select the Settings option from the drop-down list as shown.

Here, select the Settings option. Fix Firefox Connection Reset Error

4. Now, navigate to the Privacy & Security section in the left pane

5. Scroll down to the Cookies and Site Data section and click on Clear Data… option as shown in the pic below.

scroll down the right screen to the Cookies and Site Data menu. Fix Firefox Connection Reset Error

6. Here, uncheck the Cookies and Site Data box and make sure you check the Cached Web Content box, as shown below.

Note: Unchecking Cookies and Site Data will clear all cookies and site data stored by Firefox, sign you out of websites, and remove offline web content. Whereas clearing Cached Web Content will not affect your logins.

Uncheck the Cookies and Site Data box and make sure you check Cached Web Content box. Click Clear.

7. Finally, click on the Clear button to clear the Firefox cached cookies.

8. Then, click on the Manage Data… button.

click on Manage data in cookies and site data section in Privacy and Security menu Mozilla Firefox

9. Type the site name in the Search websites field whose cookies you want to remove.

10A. Select the websites and click on Remove Selected to remove only the selected items.

10B. Alternatively, select Remove All to remove all cookies and storage data.

11. Finally, click on the Save Changes button.

Type the site name in the Search websites field whose cookies you want to remove. Click Save Changes. Fix Firefox Connection Reset Error

12. Close the browser and reboot your PC.

Also Read: How To Fix Firefox Black Screen Issue

Method 2: Update Firefox Extensions

If you have any problematic extensions enabled in your browser, you may face Firefox connection reset issue. To resolve it, update the extensions in your browser. Here are a few instructions to update Firefox extensions.

1. Click on the Menu icon in the Firefox browser.

Now, click on the Menu icon at the top right corner of the screen. Fix Firefox Connection Reset Error

2. Click Add-ons and themes as shown.

click on add ons and themes in Mozilla firefox menu options

3. Here, click on Extensions in the left pane, and click on the gear icon corresponding to your extension.

Here, click on Extensions in the left pane, and in the right pane, click on the gear icon corresponding to your extension. Fix Firefox Connection Reset Error

4. Now, select the Check for Updates option as shown.

Now, select the Check for Updates option

5A. Now, if you found any updates, follow the on-screen instructions to update your extension.

5B. If there is no update available, then it will display No updates found message.

Now, if you found any updates, follow the on-screen instructions to update your extension. Fix Firefox Connection Reset Error

Method 3: Disable or Remove Firefox Extensions

If you did not attain any fix by updating your Firefox extensions, you can disable them by following the below-mentioned steps.

Option I: Disable Extensions

1. Navigate to Firefox Add-ons and themes page as shown in Method 7.

2. Then, click on Extensions in the left pane and switch Off the toggle for the extensions (e.g. Grammarly for Firefox).

Then, click on Extensions in the left pane and toggle off the extensions. Fix Firefox Connection Reset Error

Likewise, disable all the extensions one by one and check which is causing the issue by checking it repeatedly.

Option II: Remove Extensions

1. Go to the Mozilla Firefox > Add-ons and themes > Extensions as illustrated in Method 7.

2. Click on the three dots icon next to the extension and select the Remove option as shown.

Finally, if you have identified which extension is causing you the trouble, click on the three dotted icon corresponding to it and select the Remove option.

Also Read: How to Clear Cache and Cookies in Google Chrome

Method 4: Disable Work Offline Option

The web pages you have visited will be stored in Firefox’s cache. If you are not connected to any network, you can still visit that webpage using the Work Offline option. Sometimes, this option may lead to this PR_CONNECT_RESET_ERROR Firefox issue. Follow the below-mentioned steps to disable the Work Offline option.

1. Launch Firefox as done earlier.

2. Right-click on the Menu icon.

Right click on the Menu icon

3. Select Menu bar.

Select Menu bar

4. Click File in the top right corner of the screen.

Click File in the top right corner of the screen. Fix Firefox Connection Reset Error

5. Click on the Work Offline option to uncheck it.

Click on the Work Offline option to uncheck it

Method 5: Disable DNS Prefetch

DNS prefetching feature may speed up browsing in Firefox. Sometimes when it crashes, this feature might interfere with the normal loading of sites and lead to Firefox couldn’t load  or connection reset issue. Try to disable DNS prefetching feature as instructed below.

1. Open Firefox and type about:config in the address bar and hit the Enter key.

Open Firefox and type about config in the address bar.

2. Now, click on Accept the Risk and Continue option.

Launch Firefox and type about:config in its address bar. Now, click on Accept the Risk and Continue button. Fix Firefox Connection Reset Error

3. Type network.dns.disablePrefetch in the search bar and hit Enter key.

Now, type network.dns.disablePrefetch in the search bar.

4. Here, click on the toggle button to turn the network.dns.disablePrefetch from False to True.

Here, turn the toggle button from False to True. Fix Firefox Connection Reset Error

5. Finally, reload the site and check if you face PR_CONNECT_RESET_ERROR Firefox issue again.

Also Read: How to Fix Firefox Not Playing Videos

Method 6: Disable IPv6

IPV6 protocol is used as default by several browsers. Yet, sometimes this browser may interfere with your browser, causing these issues. To resolve the errors, disable IPV6 as instructed below.

1. Open Firefox and go to about:config page, then click on Accept the Risk and Continue button as shown

2. Here, search for network.dns.disableIPv6 from the Search preference name field.

Here, type network.dns.disableIPv6 in the Search preference name field, Fix Firefox Connection Reset Error

3. Now, change the setting to True by clicking on the toggle button as highlighted below.

Now, change the setting to True by using the toggle button in the extreme right corner.

4. Finally, reload the page.

Method 7: Modify Do Not Track Option

This option will send a signal to the browser’s header not to track the cookies of the website you are visiting. This feature may also cause PR_CONNECT_RESET_ERROR Firefox issue. Follow the below steps to disable it.

1. Launch Firefox as done earlier.

2. Now, click on the menu icon at the top right corner of the screen.

Now, click on the Menu icon at the top right corner of the screen

3. Here, select the Settings option from the drop-down list as shown.

Here, select the Settings option. Fix Firefox Connection Reset Error

4. Select Privacy & Security section in the left pane.

Select Privacy & Security section in the left pane

5. Here, select Always under Send websites a Do Not Track signal that you don’t want to be tracked.

select Always under Send websites a Do Not Track signal that you don’t want to be tracked. Fix Firefox Connection Reset Error

Also Read: Fix Server Not Found Error in Firefox

Method 8: Reset TCP/IP

Few users have reported that you could fix this error in Firefox when resetting the TCP/IP configuration. Follow & implement the below-instructed steps to fix PR_CONNECT_RESET_ERROR Firefox issue.

1. Hit the Windows key, type Command Prompt, and click on Run as administrator.

Search for Command Prompt in the Windows search bar and click on Run as Administrator

2. Now, type the following commands one by one in the command window and hit Enter after each command.

ipconfig /release
ipconfig /all
ipconfig /flushdns
ipconfig /renew

Type the above listed commands. Fix Firefox Connection Reset Error

3. Finally, wait for the commands to be executed and reboot your PC.

Method 9: Remove Winsock Catalog Entries

Winsock enables your OS to set a TCP/IP connection whenever you connect to the network. Yet, several entries are created for established connections leading to PR_CONNECT_RESET_ERROR or PR END OF FILE Firefox error. You can clear them by using the below-discussed instructions.

1. Navigate to the search menu, type command prompt, and click Run as administrator.

Open Start menu, type Command Prompt and click on Run as administrator on the right pane.

2. Now, type the command given below and hit Enter.

netsh winsock reset

Open Command Prompt as an administrator. Type the following command netsh winsock reset and press Enter.

Also Read: Fix Your Connection is not Secure Error on Firefox

Method 10: Modify LAN Settings

Several network connectivity issues may lead to this PR_CONNECT_RESET_ERROR Firefox issue, and you can fix them by resetting local network settings, as discussed below.

1. Press the Windows key, type Control Panel and click on Open.

Type Control Panel in the Windows search bar. Fix Firefox Connection Reset Error

2. Now, set the View by option to Category.

3. Select the Network and Internet settings.

Now, set the View by option to Category and select the Network and Internet link. Fix Firefox Connection Reset Error

4. Here, click on Internet Options as shown below.

Here, click on Internet Options

5. Now, in the Internet Properties window, switch to the Connections tab.

6. Select LAN settings, as highlighted below.

Now, in the Internet Properties window, switch to the Connections tab and select LAN settings. Fix Firefox Connection Reset Error

7. Here, check the box Automatically detect settings and ensure Use a proxy server for your LAN box is unchecked.

Note: You can enable the option again when you need it.

Uncheck the box that says Use a proxy server for your Lan and click on OK

8. Finally, click on OK to save the changes and check if the issue is resolved.

Method 11: Delete WLAN Profiles

WLAN (Wireless) profiles will be created whenever you connect to any wireless network. This profile contains a unique network name, keys, and other related settings that help your system connect to the network. You can remove WLAN profiles by following the below-mentioned steps and fix PR_CONNECT_RESET_ERROR Firefox issue.

1. Hit the Windows + R keys simultaneously to open Settings.

2. Click on the Network & Internet setting.

go to windows settings and select network and internet

3. Now, click on the Wi-Fi menu from the left pane.

Now, the Settings window will pop up on the screen. Click on Wi-Fi.

4. Then, scroll down, click on the Manage known networks option.

Now, scroll down the right menu, click on Manage known networks. Fix Firefox Connection Reset Error

5. Here a list of wireless networks you successfully paired up earlier will be displayed on the screen. Click on any wireless network that seems unnecessary and select the Forget option.

Click on any wireless network and select the Forget option

Now, the WLAN profile will be removed from your system. Next, connect to a web page and check if you face Firefox connection reset error again.

Also Read: How to Enable Incognito Mode in Chrome

Method 12: Disable Protocol Filtering (If Applicable)

If you have installed some antivirus program like ESET on your PC, you must ensure whether you have enabled the TCP protocol filtering option in Advanced settings. Consider turning off the feature as instructed as follows.

Note: If you are using another antivirus program that deploys a Protocol filtering option, follow the steps accordingly.

1. Launch the ESET antivirus program and switch to the Setup section as shown below.

Launch ESET antivirus program and switch to the Setup section. Fix Firefox Connection Reset Error

2. Now, click on the Advanced setup option at the bottom right corner of the screen, as shown above.

Note: Open the ESET Antivirus program and hit F5 to directly navigate to the Advanced setup page.

3. Here, click on the WEB AND EMAIL section in the left pane as depicted.

Here, click on WEB AND EMAIL section in the left pane

4. Now, head towards the PROTOCOL FILTERING section and toggle off the Enable application protocol content filtering option as shown.

5. Finally, click on OK to save the changes.

Now, head towards the PROTOCOL FILTERING section and toggle off Enable application protocol content filtering option. Fix Firefox Connection Reset Error

Check if you have fixed PR_CONNECT_RESET_ERROR Firefox issue.

Method 13: Disable VPN and Proxy

Follow these steps to disable VPN and proxy.

Step I: Disable VPN

If you are using a VPN client, try disabling it from the system and check if Firefox connection reset error is fixed or not. Follow the below-mentioned steps to disable the VPN client in your system .

1. Hit the Windows key, type VPN Settings in the Windows Search Bar, and click on Open.

type vpn settings and click on Open in Windows 10 search bar

2. In the Settings window, select the Connected VPN (e.g. vpn2). 

select the VPN in vpn settings. Fix Firefox Connection Reset Error

3. Click on the Disconnect button.

click on Disconnect button to disconnect vpn

4. Now, switch Off the toggle for the following VPN options under Advanced Options:

  • Allow VPN over metered networks
  • Allow VPN while roaming

In the Settings window, disconnect the active VPN service and toggle off the VPN options under Advanced Options. Fix Firefox Connection Reset Error

Also Read: How to Fix Chrome Ran Out of Memory

Step II: Disable Proxy

Disabling proxy may also help in fixing Firefox connection reset issue. Follow the below steps.

1. Press the Windows + I keys simultaneously to open Settings.

2. Then, to open it, click on the Network & Internet setting.

Click Network and Internet

3. Go to the Proxy tab on the left pane

Click Proxy on the left pane of the screen. Fix Firefox Connection Reset Error

4. Here, toggle OFF the following settings.

  • Automatically detect settings
  • Use setup script
  • Use a proxy server

Here, toggle OFF Automatically detect settings, Use setup script, and Use a proxy server options

5. Now, reload the web page and check if PR_CONNECT_RESET_ERROR Firefox issue is fixed.

Method 14: Increase Maximum Transmission Unit (MTU)

You can increase the internet speed by increasing Maximum Transmission Unit (MTU) and TCP Window Receive (RWIN) parameters. Follow the below-mentioned steps to implement them.

1. Press and hold Windows + I keys together to open Settings.

2. Now, click on Network & Internet as shown.

Click Network and Internet. Fix Firefox Connection Reset Error

3. Now, note down the network name (dharani) under which you are connected.

Now, note down the network name under which you are connected to.

4. Now, open Command Prompt as administrator and type the following command. Then, hit Enter key.

netsh interface IPv4 set subinterface “dharani” mtu=1472 store=persistent

Note: Replace the quoted text with your network name.

Replace the quoted text with your network name, type the command and press Enter

Check if you have fixed PR_CONNECT_RESET_ERROR Firefox issue.

Also Read: Fix Google Chrome Not Updating

Method 15: Uncheck AppEx Networks Accelerator Feature (For Ethernet Adapter)

If you use a wired connection, the AppEx Networks Accelerator Feature slows down the network speed, thus leading to Firefox connection reset error. Disable this feature by using the following steps.

1. Navigate to Settings, followed by Network & Internet as you did in previous methods.

Click Network and Internet

2. Now, click on the Ethernet tab and select Change adapter options under Related settings as shown below.

Now, click on the Ethernet tab and select Change adapter options under Related settings

3. Then, right-click on your network and click on Properties as shown.

Then, right click on your network and click on Properties. Fix Firefox Connection Reset Error

4. In the Networking tab, search for AppEx Networks Accelerator and uncheck it.

uncheck AppEx Networks Accelerator in ethernet adapter properties. Fix Firefox Connection Reset Error

5. Finally, check if you have fixed this issue.

Method 16: Update or Reinstall Network Drivers

Follow these steps to update or reinstall network drivers.

Option I: Update Drivers

If the current drivers in your system are incompatible/outdated with the browser files, then you will face PR_CONNECT_RESET_ERROR Firefox error. Therefore, you are advised to update your device and drivers to prevent Firefox connection reset problem.

1. Type Device Manager in the Windows 10 search menu.

Click on Start and type Device Manager. Click on Open

2. Double-click on Network adapters to expand it.

3. Right-click on your wireless network driver (e.g. Qualcomm Atheros QCA9377 Wireless Network Adapter) and select Update driver, as depicted below.

Double click on Network adapters

4. Next, click on Search automatically for drivers to automatically download and install the best available driver.

Next, click on Search automatically for drivers to locate and install the best available driver. Fix Firefox Connection Reset Error

5A. Now, the drivers will update and install to the latest version, if they are not updated.

5B. If they are already in an updated stage, the message saying The best drivers for your device are already installed will be shown.

The best driver for your device are already installed

6. Click on the Close button to exit the window and restart your PC.

Option II: Reinstall Drivers

If updating drivers did not fix Firefox connection reset error & not responding issue, you can uninstall the network drivers and install them again. Then, follow the below-mentioned steps to implement the same to fix PR_CONNECT_RESET_ERROR Firefox issue.

1. Launch the Device Manager using the steps mentioned above.

2. Expand Network adapters by double-clicking on it.

3. Now, right-click on the driver and select Uninstall device.

right-click on the driver and select Uninstall device

4. Now, a warning prompt will be displayed on the screen. Check the box Delete the driver software for this device and confirm the prompt by clicking Uninstall.

a warning prompt will be displayed on the screen. Check the box Delete the driver software for this device and confirm the prompt by clicking Uninstall

5. Visit the manufacturer’s website ( e.g. Intel) to download the driver manually.

intel dual band wireless driver download page. Fix Firefox Connection Reset Error

6. Once downloaded, double-click on the downloaded file and follow the given instructions to install it.

Also Read: Fix Crunchyroll Not Working on Chrome

Method 17: Update Firefox

An outdated version of the browser may also cause this PR_CONNECT_RESET_ERROR Firefox error. Firefox often releases updates to fix bugs in it. Hence, update Firefox to fix Firefox connection reset issue as instructed below.

1. Go to Firefox browser and select the menu icon.

2. Now, select the Help option as highlighted below.

Now, select the Help option

3. Then, click on About Firefox as shown below.

Then, click on About Firefox.

4A. If your Firefox is up-to-date, it will display Firefox is up to date.

If your Firefox is up to date, it will display Firefox is up to date. Fix Firefox Connection Reset Error

4B. If an update is available, follow the on-screen instructions to update Firefox.

Method 18: Whitelist Website or Disable Antivirus Temporarily (Not Recommended)

Sometimes, the antivirus program in your system might prevent you from accessing any URL, considering it as a threat. To resolve this PR_CONNECT_RESET_ERROR Firefox issue, you can either whitelist the website or disable the antivirus program as instructed below.

Note: Here, Avast Free Antivirus is taken as an example. You can follow the steps according to your antivirus application.

Option I: Whitelist Website URL

If you do not want Avast to block any specific website, you can also whitelist the URL by following the below-mentioned steps and fix Firefox connection reset error.

1. Navigate to the Search Menu, type Avast and click on Open, as shown.

type avast and click open in windows search bar. Fix Firefox Connection Reset Error

2. Click on the Menu option at the top right corner.

Now, click on the Menu option at the top right corne

3. Next, click on Settings from the drop-down list.

Now, click on Settings from the drop down list. Fix Firefox Connection Reset Error

4. In the General tab, switch to the Exceptions tab and click on ADD ADVANCED EXCEPTION as illustrated below.

In the General tab, switch to the Exceptions tab and click on ADD ADVANCED EXCEPTION under the Exceptions field. Fix ERR Connection Reset Windows 10

5. Now, in the new window, click on Website/Domain as highlighted below.

Now, in the new window, click on Website or Domain. Fix Firefox Connection Reset Error

6. Now, paste the URL under the Type in url path section. Next, click on ADD EXCEPTION option. Refer to the pic.

Now, paste the URL in the Type in url path. Next, click on ADD EXCEPTION option

7. If you want to remove the URL from the Avast whitelist, go to the Settings > General > Exceptions menu and click on the Trash icon as depicted below.

If you want to remove the URL from the Avast whitelist, then in the main Settings window, hover over your URL and click on the Trash icon. Fix Firefox Connection Reset Error

Also Read: How to Enable DNS over HTTPS in Chrome

Option II: Disable Antivirus Temporarily

If you did not fix Firefox connection reset error by adding an exception to the URL in your antivirus program, you could disable them by implementing the steps as instructed below.

1. Navigate to the Antivirus icon in the Taskbar and right-click on it.

Navigate to the Antivirus icon in the Taskbar and right click on it

2. Now, select the Avast shields control option.

Now, select the Avast shields control option, and you can temporarily disable Avast. Fix Firefox Connection Reset Error

3. Select any option given below to disable Avast temporarily.

  • Disable for 10 minutes
  • Disable for 1 hour
  • Disable until computer is restarted
  • Disable permanently

Choose the option according to your convenience and confirm the prompt displayed on the screen.

4. Now, go back to the main window. Here, you have turned off all shields from Avast. To activate the settings, click on TURN ON.

To activate the settings, click on TURN ON. Fix Firefox Connection Reset Error

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We hope that this guide was helpful and you could fix Firefox connection reset error. Let us know which method worked for you the best. Also, if you have any queries/suggestions regarding this article, then feel free to drop them in the comments section.

Posted by

Elon Decker

Elon is a tech writer at TechCult. He's been writing how-to guides for about 6 years now and has covered many topics. He loves to cover topics related to Windows, Android, and the latest tricks and tips.

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