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Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

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New Contributor

Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

Yesterday I decided to check the setting "Clear Cache on Exit". This morning I couldn't start Firefox. It hangs and stays like that. I saw another post somewhere about this same issue. I created a new profile and that worked fine. It's only stuck when I try to use my old profile. It doesn't work in safe mode either. Is there anyway to turn off this setting outside of Firefox.

I've also tried downgrading to 24 and upgrading to 26 beta. Neither worked.

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Site Moderator

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

You can check for problems with preferences.

Rename or delete the prefs.js file and possible numbered prefs-##.js and user.js files to reset all prefs to the default value.

You can try to clear the cache manually on disk.
See the about:cache page for the location.
It is best to avoid using external programs to clean up your personal Firefox data and use built-in Firefox means instead.

16 REPLIES
Legendary Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

Hello Relluii, try from win command line

  • firefox -preferences

thank you

New Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

I tried it but that only brings up a Firefox 32 bit then hangs. Nothing ever pops up but I can see the process in task manager.

Legendary Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

any luck if you boot the computer in Windows Safe mode with network support ?

in win 8 : hold Shift button and mash the F8 key, if you see the new recovery mode, choose See advanced repair options > Troubleshoot > Advanced options > Windows Startup Settings > click Restart button > Advanced Boot Options > choose Safe mode with networking.

(to enable F8 key for safe mode with networking in win 8, like 7 and vista, go : CTRL + SHIFT + ESC > File > Run new task > write cmd.exe in the run new task window > check mark the Create this task with administrative privileges > when you see the : C:\Windows\System64> continue and write the next command bcdedit /set {default} bootmenupolicy legacy > click Enter > you can see the Operation completed successfully. Now when you boot and hold the F8 you can see the Advanced Boot Options.....safe mode, safe mode with networking etc.)

thanks again

New Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

That didn't work either. Same thing still happens in safe mode.

Site Moderator

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

Are you only clearing the cache or cookies as well?

Note that Firefox will try to clear private data on a next start if Firefox didn't succeed doing this on the previous close (pref privacy.sanitize.didShutdownSanitize is missing or false).

Make sure that Firefox is closing properly and that there are no hanging Firefox or plugin-container processes left.

Use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.

New Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

Can't do anything. The entire Firefox process hangs. In task manager it says Firefox Not Responding. When I click anything inside of Firefox, it freezes and the cursor spins. It stays like that. I can't click File.

Site Moderator

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

Still no luck either with starting Firefox in Safe Mode?

You can use one of these to start Firefox in Safe Mode:

  • On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
  • On Mac, hold down the Options key while starting Firefox
  • Help > Restart with Add-ons Disabled

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

New Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?

Safe mode was the first thing I tried. It didn't help. A new profile worked but I do not want to do a full reset.

Legendary Contributor

Re: Checked "Clear Cache on Exit" in Firefox 25. Now it hangs on start. Is there a way to disable that setting outside of Firefox?