You can also reach this page by clicking ≡ (usually in the top right) → ? (lower right) → Troubleshooting information. If this doesn’t work, click this link, then click Solution 1.
All your extensions, themes, and added search engines will be deleted. All settings will be restored to their original state. This includes button placement and plugin preferences. Your download history will be cleared, so make sure you know where to find your downloaded files.
Windows: Hold down ⇧ Shift while opening Firefox. If this doesn’t work, search your computer for a “Mozilla Firefox (Safe Mode)” shortcut. Mac: Hold down ⌥ Option while opening Firefox. Linux: Run /path/to/firefox/firefox -safe-mode from Terminal.
Alternatively, select Start in Safe Mode to see if that solves the problem for this session. If it does, try disabling some add-ons and restarting Firefox normally. If it doesn’t, start again in safe mode and reset Firefox.
If you want to restore your add-ons or settings, change them manually instead of using this method. Restoring them from the backup will most likely recreate your old bugs.
Windows: Show Folder Mac: Show in Finder Linux: Open Directory Firefox 13 or earlier (any OS): Open Containing Folder
On Windows, you may need to show hidden files.
On a Mac, hold down Ctrl and click the file to “right-click. " If prompted, choose to replace or overwrite existing files.
search. json — your added search engines permissions. sqlite — preferences for which websites are allowed to store cookies, open popup windows, etc. mimeTypes. rdf — preferences for handling downloaded files (which program opens which file type) Firefox attempts to restore the items below automatically. You do not need to restore them yourself unless an error occurred during the reset. places. sqlite — bookmarks and browsing history key3. db and logins. json — saved passwords formhistory. sqlite — autofill information for online forms
