Here are screenshots showing the various states that I described in comment 0 - first: the initial/good state (with backarrow showing up as solid because I've navigated, forward-arrow missing due to bug 1912642) - below that, states A-C from comment 0 here, with red circles/arrows showing the UI that's changing in each frame.
Bug 1917116 Comment 3 Edit History
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Here are screenshots showing the initial state and then the 3 bad/unnecessarily-changed states that I described in comment 0 - first: the initial/good state (with backarrow showing up as solid because I've navigated, forward-arrow missing due to bug 1912642) - below that, states A-C from comment 0 here, with red circles/arrows showing the UI that's changing in each frame.
Here's a series of screenshots taken from my screencast, showing the initial state and then the 3 bad/unnecessarily-changed states that I described in comment 0. (These are in temporal order.) - first: the initial/good state (with backarrow showing up as solid because I've navigated, forward-arrow missing due to bug 1912642) - below that, states A-C from comment 0 here, with red circles/arrows showing the UI that's changing in each frame.