How to merge 2 windows in Firefox

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Music by Eric Matyas
https://www.soundimage.org
Track title: City Beneath the Waves Looping

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Chapters
00:00 Question
00:39 Accepted answer (Score 29)
01:20 Answer 2 (Score 1)
01:39 Thank you

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Full question
https://superuser.com/questions/1341688/...

Question links:
[1]: https://addons.mozilla.org/en-US/firefox.../
[2]: https://addons.mozilla.org/en-US/firefox.../
[API docs]: https://developer.mozilla.org/en-US/Add-...

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Tags
#firefox #browsertabs #firefoxquantum

#avk47