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Firefox browser

  • 4 Antworten
  • 1 hat dieses Problem
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  • Letzte Antwort von Padel

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For the last few days, my Firefox browser has gone really slow. For example it takes about a minute to retweet something. I have refreshed it and ensured it is the latest version as well as updating my laptop/restarting Firefox. The rest of my laptop and other browsers works fine so it does just seem to be Firefox. Any ideas? Thanks

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Hi, To find out the cause of the slowdown, first try restarting Firefox in Safe Mode. Firefox run without any add-ons or plugins. - Go to options ( icon with 3-line bar beside the URL bar > Click Help > Restart with Add-On Disabled. - After that, Firefox will restart and display two options:

   - Start in Safe Mode 
      or 
   - Refresh Firefox. 

Choose Start in Safe Mode. Further information click on link text

If the problem still there. Check out Quick fixes Firefox uses too much memory or CPU resources

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Thanks for your help. I refreshed Firefox and that seemed to get rid of all my add on's anyway and I've had to re-add them. Either way, I tried that starting in safe mood as well as trying a few other things such as removing hardware accelerations/removing Flash and it's improved a bit but is still pretty slow

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Some issues can be transferred if you use a refresh.

You can create a new profile as a quick test to see if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.


  • bookmarks and history: places.sqlite
  • favicons: favicons.sqlite
  • bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder
  • cookies.sqlite for the Cookies
  • formhistory.sqlite for saved autocomplete Form Data
  • logins.json (encrypted logins;32+) and key4.db (decryption key;58+) for Passwords saved in the Password Manager
    key3.db support ended in 73+; to use key3.db in 58-72, make sure to remove key4.db
  • cert9.db (58+) for (intermediate) certificates stored in the Certificate Manager
  • persdict.dat for words added to the spell checker dictionary
  • permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences)
  • sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)

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I tried switching to a new profile and it's still just as slow, e.g. when typing an email in my email account, it will often 'hang' and I have to wait for a while (30-60 seconds usually) before I can do anything (I can't switch tabs while I wait). It even did that a couple of times during writing this message. Thanks

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