Looks like this menu overflows (see attached screenshot). Most likely uses subtly different styling here and should be updated.
Bug 1917342 Comment 0 Edit History
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Steps to reproduce: 1. Right click toolbar -> Add synced tabs icon to the toolbar 2. Click it to view synced tabs Expected: - To see synced tabs look like the avatar and hamburger menu Actual: Menu overflows (see attached screenshot) and we do not see the the close remote tab dismiss button or the right arrow for inactive tabs. This button most likely uses subtly different styling here and should be updated. This happens on Nightly and Beta.