Hello, let's try a Refresh!

The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.

Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.

To Refresh Firefox:

1. Open the Troubleshooting Information page using one of these methods:
   • Click the menu button , click help and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
   • If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
2. At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
3. Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
4. Click Finish and Firefox will reopen.

Did this fix the problem? if it did, mark as solution!

Thank you.

No, unfortunately this didn't fix the issue. Still getting the same error when firefox reopens.

Hi MKII, are there any other suggestions you have? This has rendered firefox useless to me and I really don't want to switch back to chrome or safari...

Mkll said

Hello, let's try a Refresh! The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information. Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information. To Refresh Firefox:

1. Open the Troubleshooting Information page using one of these methods:
   • Click the menu button , click help and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
   • If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
2. At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
3. Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
4. Click Finish and Firefox will reopen.

Did this fix the problem? if it did, mark as solution! Thank you.

Certain Firefox problems can be solved by performing a Clean reinstall. This means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.

To do a clean reinstall of Firefox, please follow these steps: Note: You might want to print these steps or view them in another browser.

1. Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
2. After the download finishes, close all Firefox windows (or open the Firefox menu and click the close button ).
3. Delete the Firefox installation folder, which is located in one of these locations, by default:
   • Windows:
     • C:\Program Files\Mozilla Firefox
     • C:\Program Files (x86)\Mozilla Firefox
   • Mac: Delete Firefox from the Applications folder.
   • Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
4. Now, go ahead and reinstall Firefox:
   1. Double-click the downloaded installation file and go through the steps of the installation wizard.
   2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

More information about reinstalling Firefox can be found here.

WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles.

Please report back to say if this helped you!

Thank you.

Hi MKII I tried doing this initially, it did not work.

Any other suggestions?

Mkll said

Certain Firefox problems can be solved by performing a Clean reinstall. This means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location. To do a clean reinstall of Firefox, please follow these steps: Note: You might want to print these steps or view them in another browser.

1. Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
2. After the download finishes, close all Firefox windows (or open the Firefox menu and click the close button ).
3. Delete the Firefox installation folder, which is located in one of these locations, by default:
   • Windows:
     • C:\Program Files\Mozilla Firefox
     • C:\Program Files (x86)\Mozilla Firefox
   • Mac: Delete Firefox from the Applications folder.
   • Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
4. Now, go ahead and reinstall Firefox:
   1. Double-click the downloaded installation file and go through the steps of the installation wizard.
   2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

More information about reinstalling Firefox can be found here. WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles. Please report back to say if this helped you! Thank you.

Firefox just updated to 57.0.2 and still having the same issue.

Please : go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check (put a tick in the box) the setting to Prevent Accessibility Services from accessing your browser.

Monitor in Task Manager. Should stay below 2 gigs. If excessive then do below and monitor and change if need to...Test and go up again , go back down, it will eventually get a zone you and it can live with.

Go to the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please.

Please let us know if this solved your issue or if need further assistance.

Hi, Unfortunately this hasn't worked either. Still hoping for a solution.

Pkshadow said

Please : go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check (put a tick in the box) the setting to Prevent Accessibility Services from accessing your browser. Monitor in Task Manager. Should stay below 2 gigs. If excessive then do below and monitor and change if need to...Test and go up again , go back down, it will eventually get a zone you and it can live with. Go to the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please. Please let us know if this solved your issue or if need further assistance.

Perhaps you have a video driver issue, be sure your video drivers are up to date. Thank you.

Can you open a blank page (about:blank) if you start Firefox via a terminal window?

Open a terminal window to start Firefox (firefox or firefox-bin) with command line switches.

• Mac HD > Applications > Utilities > Terminal
• /Applications/Firefox.app/Contents/MacOS/firefox -url about:blank

• https://developer.mozilla.org/Command_Line_Options

Mkll said

Perhaps you have a video driver issue, be sure your video drivers are up to date. Thank you.

I have an imac, they don't really update the drivers very often.

cor-el said

Can you open a blank page (about:blank) if you start Firefox via a terminal window? Open a terminal window to start Firefox (firefox or firefox-bin) with command line switches.

• Mac HD > Applications > Utilities > Terminal
• /Applications/Firefox.app/Contents/MacOS/firefox -url about:blank

• https://developer.mozilla.org/Command_Line_Options

When I try that I get a whole bunch of errors in terminal and the tabs still crash.

/Applications/Firefox.app/Contents/MacOS/firefox -url about:blank
[Child 68080, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68080, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68082, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68082, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68083, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68083, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Parent 68079, Gecko_IOThread] WARNING: pipe error: Broken pipe: file /builds/worker/workspace/build/src/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 709

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68088, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68088, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Parent 68079, Gecko_IOThread] WARNING: pipe error: Broken pipe: file /builds/worker/workspace/build/src/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 709

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv


###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68090, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68090, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68092, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68092, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68094, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68094, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68096, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68096, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68098, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68098, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68100, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68100, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

[Child 68103, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776
[Child 68103, Main Thread] ###!!! ABORT: LoadSheetSync failed with error 80520012 loading built-in stylesheet 'resource://gre-resources/counterstyles.css': file /builds/worker/workspace/build/src/layout/style/nsLayoutStylesheetCache.cpp, line 776

###!!! [Parent][MessageChannel] Error: (msgtype=0x150083,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

It seems upgrading to quantum 57.0.4 has resolved my issue. I don't know how or why but things seem to be working now. Keeping my fingers crossed nothing breaks again.