I could not find any documents regarding how this button should be displayed. I have a patch that removes it in the tabs sync page when there is no user signed in, but I would still like to confirm with UX that this is indeed the expected behavior.
Bug 1811976 Comment 4 Edit History
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I could not find any documents regarding how this button should be displayed. It seems like this bug was present in the xml version as well. I have a patch that removes it in the tabs sync page when there is no user signed in, but I would still like to confirm with UX that this is indeed the expected behavior.