Firefox 55.0.2 with various extensions, multiprocess enabled. Screen recording and other information available on request. Find me in irc://irc.mozilla.org/#firefox or (if you use Matrix) https://riot.im/app/#/room/#mozilla_#firefox:matrix.org – thanks.

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Rename Tab Title is one of my top ten extensions for Firefox 56.0.2 –

https://addons.mozilla.org/collections/grahamperrin/t10/

– less than five stars only because of the unresolved issue.