Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

Done that , still the same. Very slow to move to other web sites in version 92.0 If I use Chrome/Edge it's a lot quicker, but I prefer Firefox. Suggestions? Should I uninstall & re install, if so how? Also what about Bookmarks if I uninstall?

Should I uninstall & re install, if so how?

Let’s do a full clean re-install;

Note: Firefox comes in three or more folders on all computers. They are;

Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And two folders in the profile of each user on the computer for each Firefox profile for that user.

If you remove the Firefox folder, the user profiles would not be affected.

Download Firefox For All languages And Systems {web link}

Firefox ESR; Extended Support Release {web link}

Beta, Developer, Nightly versions https://www.mozilla.org/en-US/firefox/channel/desktop/

Install Older Version Of Firefox {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86) Note: Check Both Folders

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any Mozilla or Firefox program folders. Do not remove the Mozilla Thunderbird folder if there is one.

Do Not remove any profile folders.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

How to Start all Computers in Safe Mode; {web link} Free Online Encyclopedia

Have not done above yet, but another point:- I keep getting a message saying that Firefox has crashed, even though it's not open. Is this same problem?

Might have been a tab crash. Current Firefox is running several multiprocess on the computer. If one process should have issues, the others might continue on.

More than one process is normal for the current Firefox. http://www.ghacks.net/2016/07/22/multi-process-firefox/

Multi-process Firefox is codenamed "e10s". https://wiki.mozilla.org/Firefox/multiprocess

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP- in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most recent 7 - 10 Submitted crash reports, and copy them. Now go to the reply box and paste them in.

Please, Do not post a screenshot ! !

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support

These are the crash reports, does this help? 59c7004a-5160-41b4-be8c-2a91ec32408a 19/09/2021, 07:42 e302f3dd-bef3-4b88-9399-7975daad6211 14/09/2021, 09:02 24883723-2065-4ca0-9b26-37fbb4555a74 11/09/2021, 14:57 edba4327-0e7b-4200-a735-8a023068eb40 04/09/2021, 12:56 cce87469-d19a-4d40-a892-4cd4ed6540e5 29/08/2021, 07:43 b149d83f-ee2e-47fb-9839-cbb887fe2832 19/08/2021, 07:35 3896cd4a-1b92-43d7-a5dc-bd2d9680ced5 06/08/2021, 09:17 e08e0dde-706d-4520-baff-bf9b5a0097f0 25/07/2021, 07:49 c290445a-0494-4e9a-9686-deb1ed9a4446 18/07/2021, 08:01 3cc397b1-5031-407f-a3b7-1de464ade054 08/07/2021, 07:36

Note: If any reports do not have BP- in front of the numbers/letters, click it to submit them. The crash report is several pages of data. We need the report numbers to see the whole report.

Please only post the reports dated this month.

Fred, Did my post of the crash reports not help? I have now submitted those from this month Will you come back with answers?

I also note on my very slow/old laptop that F.Fox runs OK. The only difference is that i do not use AVG security on laptop.

I also note that if I leave F.Fox logged in on machine that is giving trouble that F.Fox has no problems on quickly moving to other web sites. To me it seems to be a clash with AVG updates when F.Fox starts up. Comments?

The report numbers will have changed to numbers starting with bp- Post these new numbers, just those dated this month.

Ok, these are the numbers:-

bp-c345e4b9-f4e4-428c-9a55-f35330210919	19/09/2021 13:33 
bp-8e8529fa-b8bb-4915-9ab0-fe5cb0210917	17/09/2021 13:13 
bp-ab097838-4206-4170-ab33-e4ad90210919	19/09/2021 16:23 
bp-2526b8c8-2cbf-403c-b0fb-6c8ea0210919	19/09/2021 16:23 
bp-3cb3d271-aba2-4855-a92c-dc23f0210911	11/09/2021 14:55 

bp-7b2b3a35-6b01-4672-a8d2-9dd940210905	05/09/2021 08:01 
bp-b763a58f-97f0-4df9-9205-44ffc0210919	19/09/2021 16:23 

Hope this helps, is it good information? Will you give reply? Thanks

You can check for issues with Storage (indexedDB).

• https://firefox-storage-test.glitch.me/

Sorry Cor-el, I do not understand your reply. I will wait for FredMcd analysis. Thanks

The crashes seem to be with the Quota Manager (indexdDB, local storage). If you open the webpage in my above link then you can run a test to check if there are issues reported with storage.

• Firefox 91.0.2 Crash Report [@ static mozilla::dom::quota::QuotaManager::Shutdown::<T>::operator()::<T>::__invoke ]

In case you use "Clear history when Firefox closes" then try to disable this feature.

• Settings -> Privacy & Security
  Firefox will: "Use custom settings for history":
  [X] "Clear history when Firefox closes" -> Settings
• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

• clearing "Site Preferences" clears exceptions for cookies, images, pop-up windows, and software installation and exceptions for passwords and other website specific data
• clearing "Cookies" will remove all cookies including cookies with an allow exception you may want to keep

Cor-el is smarter than I am.

Product Firefox Release Channel release Version 91.0.2

Sat, 04 Sep 2021 11:56:29 GMT bp-b763a58f-97f0-4df9-9205-44ffc0210919 = Uptime 122 seconds (2 minutes and 2 seconds) Sun, 05 Sep 2021 06:38:25 GMT bp-7b2b3a35-6b01-4672-a8d2-9dd940210905 = Uptime 349 seconds (5 minutes and 49 seconds)

Signature: static mozilla::dom::quota::QuotaManager::Shutdown::<T>::operator()::<T>::__invoke

MOZ_CRASH Reason (Sanitized) : MOZ_CRASH(Quota manager shutdown timed out)

Crash Reason EXCEPTION_BREAKPOINT

snxhk.dll = avast!

aswJsFlt.dll = avast!

This is for Sumo's Related Bugs 1588498 ASSIGNED --- [meta] Remaining issues that may cause QuotaManager shutdown hangs

The other reports are for Version 92.0 but they are the same.

Update avast!. If the problem continues, disable it.

Fred/Cor, I think you are both very bright!

The problem, I think, has now gone from my system.

Do you think it was AVG (Avast), that was causing it?

I take it you updated Avast? Great to hear.

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution.

Thank you for contacting Mozilla Support.

Yes I updated Advast. Many thanks for all help given.