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

**URL:** <https://discourse.mozilla.org/t/my-firefox-developer-edition-does-not-work-on-macos-the-interface-is-unstable-not-responding-to-clicks-version-89-0b3/79174>\
**Category:** Developer Tools\
**Created:** [April 23, 2021, 4:44pm UTC](https://discourse.mozilla.org/t/my-firefox-developer-edition-does-not-work-on-macos-the-interface-is-unstable-not-responding-to-clicks-version-89-0b3/79174 "2021-04-23T16:44:56Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![jdescottes](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/jdescottes/32/22185_2.png) [@jdescottes](https://discourse.mozilla.org/u/jdescottes)\
**Post date:** [April 26, 2021, 2:21pm UTC](https://discourse.mozilla.org/t/my-firefox-developer-edition-does-not-work-on-macos-the-interface-is-unstable-not-responding-to-clicks-version-89-0b3/79174/20 "2021-04-26T14:21:41Z")

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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

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

```

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