EDIT: version 1.3.2 eventually works. However, sometimes to apply new rules the extensions has to be turned off and turned on.
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EDIT: thanks but the new 1.3.1 version does not seem to work for me on FF 95 (a couple of beta versions within hours) either with the reordering toggle on or off. I reverted back to 1.2.1 for now.
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It was a great add-on until it has started to ruin all of the pinned tabs by re-ordering them for whatever reason. Additionally, this behaviour can not be turned off, and it is not fixed for many months by now; thus it seems it is here to stay. So there should be probably a different extension or fork of this to make it work as intended. Anyway, thanks to the author for the time the extension did work well in the past.

Good. One issue: I have mail.google.com configured to be pinned automatically. If I click any link in an email, it opens in a new tab and that tab unexpectedly gets auto pinned as well. I wondered if this was due to some kind of URL redirection feature on Google's side, but apparently not.

Most of the time works perfectly.

Perfect. and a life raft after loosing ability to double click tab to pin/unpin