Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

i used copyed the fire fox datebase (passwords and bookmarks) into extra hard drive then i formated me primere drive and pest the files its not working !

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by cor-el

more options

im was on linux manjaro and fedora and i did some thing bad (idk ) to fedora and it doesn't want work (fedora) sooo i copy the files of the bookmarks from manjaro and fedora (https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data) into extra drive and formated the drive that fedora + manjaro was in and installed mint 20 and iv tryed to pest the files from the extra drive and returns me errors in firefox (the files didn't worked ) what should i do

im was on linux manjaro and fedora and i did some thing bad (idk ) to fedora and it doesn't want work (fedora) sooo i copy the files of the bookmarks from manjaro and fedora (https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data) into extra drive and formated the drive that fedora + manjaro was in and installed mint 20 and iv tryed to pest the files from the extra drive and returns me errors in firefox (the files didn't worked ) what should i do

All Replies (1)

more options

Can you clarify what files you restored and to what location ?

You can copy certain files with Firefox closed to the current profile folder to transfer or recover personal data. Note that best is to avoid copying a full profile folder. Note that you should be cautious with copying SQLite database files if you previously had 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)

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

Modified by cor-el