The STR from comment 18 do not currently cause the bug to appear for me. ochameau, can you update your local instance to [have `browser.uiCustomization.debug` set to `true`], and pasting the log after startup here?
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The STR from comment 18 do not currently cause the bug to appear for me. ochameau, can you update your local instance to [have `browser.uiCustomization.debug` set to `true`](https://searchfox.org/mozilla-central/rev/1b90936792b2c71ef931cb1b8d6baff9d825592e/browser/app/profile/firefox.js#2026), and pasting the log after startup here?