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.

If you can locate your profile directory, open prefs.js and delete the corresponding line.

Eg on a local profile it was

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