I can still reproduce, if I disable the intervention as well as the `layout.css.fake-webkit-scrollbar.enabled` about:config preference. But as long as `layout.css.fake-webkit-scrollbar.enabled` is enabled, this is fixed for me. That pref is Nightly-only for now, so perhaps we should tread cautiously (e.g. instead of removing, only activate the intervention if the pref is false)?
Bug 1836872 Comment 29 Edit History
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I can still reproduce, if I disable the intervention as well as the `layout.css.fake-webkit-scrollbar.enabled` about:config preference. But as long as `layout.css.fake-webkit-scrollbar.enabled` is `true`, this is fixed for me and we get a submenu that covers up the scrollbar as in comment 1 and comment 2). That pref is [Nightly-only for now](https://searchfox.org/firefox-main/rev/9a3317a65545e83f4e32b94fdf1f6860342423ef/modules/libpref/init/StaticPrefList.yaml#11255,11257), so perhaps we should tread cautiously (e.g. instead of removing, only activate the intervention if the pref is false)?