george_vlantis said

Latest promotion to upgrade says "Browser setting will be set to defaults". Will I lose my bookmarks and passwords?

Hi George, No you will not loose your bookmarks and passwords. Just to be safe, make sure you have your information synced before the upgrade. that way you can still get them after the upgrade.

You can read more from How do I set up Sync on my computer?

Cheers

That button will run the Refresh feature. You can skip it and Refresh later if you decide it will help you.

This article describes what is kept and what is lost in a Refresh: Refresh Firefox - reset add-ons and settings

See also:

• https://support.mozilla.org/kb/Backing+up+your+information
• https://support.mozilla.org/kb/restore-bookmarks-from-backup-or-move-them