You should contact thier support to find out why it stop working with Firefox.

What OS? What version of Firefox? It's an add-on and the only option is to uninstall and reinstall, but before that. Try the below workaround. '''Workaround....''' Download another version of Firefox [https://www.mozilla.org/en-US/firefox/channel/desktop/ (Beta, Dev, or Nightly)]. '''Make sure to install in a different directory than your current install.''' Then use sync to get your data into that browser and see if the add-on is synced and working in the new browser. Bitwarden does have a [https://support.mozilla.org/en-US/kb/sync sync] option so the data it has should [https://support.mozilla.org/en-US/kb/sync sync] to the new browser. If so, then you can uninstall and reinstall it in the current browser with the issue. '''Suggestion''' Run more than one browser on multiple devices so that your data is not in just 1 place. see old screenshot Sync info... FYI... Firefox Sync IS NOT A DATA BACKUP SERVICE '''https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer''' '''https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox''' https://support.mozilla.org/en-US/kb/sync https://www.mozilla.org/en-US/firefox/features/sync/ https://hacks.mozilla.org/2018/11/firefox-sync-privacy/ Sync is not a backup tool but it is a good sync/transfer/move tool https://support.mozilla.org/en-US/forums/contributors/707681