This will be the fourth time in as many days that this issue has occurred for me. Basically, I could search, choose and install anywhere between one and many (in other words the number of add-ons has varied greatly during this so it appears to be irrelevant) add-ons and upon what I think is just closing the browser (not necessarily restarting my laptop (windows) I open my add-ons/extensions/themes/etc section and there’s NOTHING there. It’s become absolutely infuriating having to spend all that time searching for and re-installing my add-ons literally every single time I close and open the browser, which can’t just be avoided either as my laptop is old and creaky and likes to crash things constantly. What is the problem here? Oh and I’ve also gone into the sync settings and turned off add-ons for when it syncs my iPhone and laptop. So that box, checked or unchecked is also unrelated. I haven’t been able to even figure out why it’s happening, aside from the measures necessary to actually fix it. Obviously I can’t know that until I know what is causing it. And this was out of the blue four days ago...I haven’t changed any options or anything at or before that time or allowed any updates. K...good luck with this one. I don’t even know where to begin.