Is it safe to delete Firefox cache?
Web pages, images and other files that Firefox saved so websites load faster, with a folder for each profile.
Safe
Its owner recreates it by itself when it needs it, and nothing you made is lost.
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What it is
Firefox keeps each profile's web cache, startup cache and page thumbnails here, separate from the profile itself in Application Support. Firefox downloads anything it needs again, so your bookmarks, passwords, history and open tabs aren't affected.
If it's removed
Websites load more slowly the first time you visit them again, while the browser downloads their content again. You stay signed in to websites, and your bookmarks, history and passwords aren't affected.
How it's removed
Moved to the Trash, where you can restore it. Quit Firefox first.
The free analyzer finds it and explains it. Removing it is Pro, after a review sheet that lists every move and command. It starts checked in the Cleanup checklist, except inside Documents or Desktop.
Sources
- support.mozilla.org/en-US/questions/1367367
- support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
- github.com/Homebrew/homebrew-cask/blob/master/Casks/f/firefox.rb
Last checked on 26 Sep 2026. Every entry is written and checked by hand; the app and the command-line tool use the same words.