My "Firefox Developer Edition" does not work on MacOS: The interface is unstable - not responding to clicks. Version 89.0b3

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I think I found the preference responsible for the bug: browser.uiCustomization.state.

I’ve encountered this issue on Windows and not Mac OS, but I can confirm that deleting this pref solves the issue for me.

This was the value:

user_pref("browser.uiCustomization.state", "{\"placements\":{\"widget-overflow-fixed-list\":[]},\"seen\":[\"developer-button\",\"profiler-button\"],\"dirtyAreaCache\":[],\"currentVersion\":16,\"newElementCount\":0}");

If it helps, I can also send you my profile folder backup if there is anything else in there that would indicate more.

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