The last two times I've upgraded Firefox, it was reverted back to previous appearance. The first time I went to 4.0 and I couldn't change the persona or get rid of the old one. I just upgraded to 8. For a couple of days the persona was changed and the layout in the menus (especially Bookmarks) had "bookmark this page" at the top of the menu. Today, it has reverted back to the settings in 4.0 and "bookmark this page" is second on the menu. When I opened Firefox, my new persona would be there, but as soon as I click on Bookmarks> bookmark this page, that old pesona pops up instantly. I've deleted all the themes and personas. I'm really disgusted with this. I have come to greatly dislike that snowflake persona. It doesn't matter what I do, it is determined to stay. I'll try one more thing. Uninstall Firefox then reinstall.