Here some observations given that I hit the problem again on https://github.com/notifications?query=is%3Aunread: 1. It's only the Github tab that is affected (it doesn't make a difference if it is pinned or not) - no other tabs of the same window show the issue. 2. Opening a new Github tab in the same window also shows the issue. 3. Tearing off the Github tab into a new window makes the issue go away.
Bug 1680855 Comment 7 Edit History
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Here some observations given that I hit the problem again on https://github.com/notifications?query=is%3Aunread: 1. It's only the Github tab that is affected (it doesn't make a difference if it is pinned or not) - no other tabs of the same window show the issue. 2. Opening a new Github tab in the same window also shows the issue. 3. Tearing off the Github tab into a new window makes the issue go away. 4. The Github tab in the original window is still affected.