I just installed Firefox (88.0) on a brand new Surface Pro, signed in to my Firefox Account, which gets me my stuff synced over, such as the Grammarly, LastPass and Pushbullet extensions. I log into those respective applications as needed. I start browsing. Now, when I open either of those extensions from the menu bar, they open their little in-place window. If I now touch anything in these windows, about 80% of the time the following happens: * The little in-place window closes * Firefox becomes unresponsive (menus, other controls, web pages, close window) * This lasts for '''60 seconds''' (reliably) However: * If the extension is visible on the menu bar: '''problem happens''' * If the extension is tucked away in ">>" (More tools...): '''no problem''' (this is also a decent-ish workaround) Given that this affects multiple extensions, I'd expect this to be a Firefox issue. Also, I have no idea how to troubleshoot this (I have not been able to find logs). Things I tried to no avail: * Refresh (through installer) * Cleaned out profile manually * Tried extensions before logging them in Thank you for your help.