I can add some extra info. I think it's safe to say that my instance
had become corrupt somehow. (It's still a bug that it could become so
corrupt, but I don't know how to duplicate that).
On closing tabs, I discovered that I had roughly 200 tabs open. Clearly
firefox now hides tabs well so that it's not so obvious between 20 and
200. Then, and perhaps related to this bug, those tabs were all
duplicated. So my firefox instance actually had on the order of 400
tabs.
Closing all of the tabs and then opening a new window (or even
relaunching firefox) caused 200 or so tabs all to re-open.
Eventually, I did the following: clear cache (a bit cargo cult of me)
and set firefox to open a blank page on restart. Two restarts later and
I was able to revert to "open windows from last session".
Again, it seems to me a bug that this could arise at all, but in the
absence of a good hunch on what code is being tickled or quite a lot of
people being affected, this should probably be closed as not worth
pursuing.
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https://bugs.launchpad.net/bugs/1736355
Title:
opening a new window re-opens all the tabs in the front window
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