I made a screencast to demonstrate the problem. As you can see this always happens when you scroll all the way to the right. The "textoverflow" attribute of #urlbar always changes from "end" to "start" when this happens. It seems to be that is has something to do with this change: https://hg.mozilla.org/mozilla-central/rev/b6233f4d899c3da8143461b19201baf69e63595f But the Bugzilla ticket is not public so it's only a guess. I'll ni? the patch author and reviewer because so far no one has been able to reproduce the issue. Do any of you have any ideas? It only happens on my machine with macOS Catalina Beta 4/6 but not on another machine with macOS 10.11.
Bug 1574257 Comment 4 Edit History
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I made a screencast to demonstrate the problem. As you can see this always happens when you scroll all the way to the right. The "textoverflow" attribute of #urlbar always changes from "end" to "start" when this happens. It seems to be that is has something to do with this change: https://hg.mozilla.org/mozilla-central/rev/b6233f4d899c3da8143461b19201baf69e63595f But the Bugzilla ticket is not public so it's only a guess. I'll ni? the patch author and reviewer because so far no one has been able to reproduce the issue. Do any of you have any ideas? It only happens on my machine with macOS Catalina Beta 4/6 but not on another machine with macOS 10.11 and it also happens with a new Firefox profile.