The Firefox 127 update should not erase bookmarks. However, if you canceled a Primary Password prompt, Firefox 127 can start up in a broken state where you do not see any bookmarks on the Bookmarks Toolbar and you can't restore your previous session. If you don't need help restoring your previous session windows and tabs, you can close out of Firefox and restart it. If you are still missing bookmarks, try the steps in the following article to restore an automatic bookmark backup: [[Restore bookmarks from backup or move them to another computer]]