Mozilla Support Team told me to post this the Forum. I am reaching out for technical support regarding an issue I encountered after attempting to update Firefox from version 11.5 to 20+ (ESR) for macOs 10.15.7 Catalina. I have saved a back-up of all original files before attempting the update. The update did not take effect, and I subsequently lost all previously saved bookmarks and passwords on Firefox. I have also disabled all restrictions, including ad blockers, "Recommend extensions as you browse," and "Recommend features as you browse." I successfully imported my bookmarks from an HTML file into Chrome, which worked on the first attempt, and they are now saved there. Despite this, I have been working with AI for the past few days to troubleshoot various steps without success. Currently, Firefox is unable to save anything in "Favorites," including recent "Log-ins & Passwords" nor can I upload bookmarks: Export from Chrome or from my hard drive. Whenever I try to upload, the process stalls and never finishes. While I successfully imported saved logins from Chrome, Firefox does not recognize any bookmarks, and I am still using version 11.5 despite Firefox indicating that I am up to date. I would greatly appreciate your assistance in resolving these issues. Update: Every time I restart my computer everything gets lost all over again and having to start from scratch. Thank you for your help.