I will stop using Firefox. It is the end for me with Firefox, reason Sync and Bookmarks. No matter what I do, every time I delete a bookmark, it instantly pops up back, duplicate bookmarks everywhere, delete them and they magically pop up again. I researched the internet for months with no solution, I tried every solution that showed up in search results, nothing resolved the issue. I even disabled sync, and yet the deleted bookmarks pop up again, I deleted ALL my bookmarks and like magic they are back. So, after so many years I decided to find another browser that will not give me that much headache...