I'm using Firefox 86.0 on an Apple Silicon Mac mini (16 GB/2TB) with macOS 11.2. Several times a day when I return to the browser, it will have become completely unresponsive to clicks and or typing. In this state, I can't click on web pages, or controls in the tab bar. However, the app is not beach-balling. I can quit by right clicking on the dock icon and choosing quit from the menu (I don't have to force quit). Relaunching fixes things. Also, if I have, for example, clicked on the "new tab" button in the tab bar, once I've quit and launched again, the new tab will be in the window, indicating that the command was processed, but the result was not visible. Sometimes, but not always, when in this state the page display looks like it has been scaled to about 50%. (As if I'd hit "Zoom out" five times). One clue that may relate to this is, I'm running in scaled mode on the monitor (The monitor is capable of 3840x2160, but I'm scaling things in the Display control panel to 2560x1440.) Apps are running in Retina mode. I have tried running Firefox in Safe mode, but that didn't help. I have a lot of tabs that I don't want to lose, so running in a fresh user profile is kind of difficult, unless there's a simple way to transfer open tabs between profiles.