How I got this bug was downloading the newest update in settings and left some tabs open, like 3 YouTube Tabs. Then I clicked instalI, firefox opens up again but without installing the update and with all tabs that were open before, no progress bar window like usual before lauching firefox after an update. So I closed all tabs, closed firefox and after opening it, it finally installed the update. I have no idea if this is a bug or a new implemented update mechanism that only updates if you dont have tabs open, so you dont loose them. I had this "bug" 2 times in a row now. Its not really a big deal but annoying to manual close the tabs. Feel free to share your thoughts and let me know if im not the only one that gets this for the newest beta release.
