Mozilla hit my bookmarks and passwords and I need help recovering them

Is there a way to UNDO what the most recent Firefox update as it has created havoc with the program.

J'ai également ce problème avec la version 154. Tous mes mots de passe ont disparu, et il était même impossible d'en rajouter, par contre j'avais mes bookmarks. La version 154 de firefox pose vraiment problème. J'ai pu récupérer une version 153.04 du logiciel, et grâce à mon compte j'ai pu tout récupérer, sauf les réglages des extensions annexes dont je n'avais pas fait de sauvegarde des paramètres. Le logiciel continue de me proposer la mise à jour vers la version 154, et il impossible de désactiver les mises à jour, et en cliquant par réflexe sur l'onglet de mise à jour, j'ai eu à nouveau le problème et j'ai du tout recommencer.

If Firefox starts up after an update without your bookmarks and other settings, check whether your data is available in a different profile:

Inside Firefox, type or paste about:profiles in the address bar and press Enter/Return to load it. The About Profiles page will open. This page should list at least one profile and could list many.

The profile that Firefox is currently using will show:
This is the profile in use and it cannot be deleted.

Please do not delete anything here; don't use any Remove buttons.

Do you have another profile named default or default-longnumber listed on this page? If so, you can check whether it is the one you were using recently by clicking its Launch profile in new browser button.

If it isn't what you want, simply close that new window.

If it IS what you want, click the Set as default profile button for that profile on the about:profiles page. Firefox will use it automatically at the next startup.

For more information see Recover user data missing after Firefox update or reinstall.

Note: If your bookmarks are not available in another Firefox profile, see Recover lost or missing Bookmarks for other solutions.