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Re:Firefox Quantum Lands in Beta, Developer Edition by virtualwhys on Tuesday September 26, 2017 @11:22AM (#15339437)
On developer edition here, no idea about Beta. Does the `about:config` option to disable signatures exist in your FF?

If so, make sure you grab the correct artifact to import[1]

[1] http://piro.sakura.ne.jp/xul/xpi/nightly/treestyletab-we.xpi

Re:Firefox Quantum Lands in Beta, Developer Edition by mannigfaltig on Tuesday September 26, 2017 @11:26AM (#15339472)
It works now on Firefox Developer Edition 57.0b3 (64-bit), macOS High Sierra. It took me a while to figure out that one needs to activate it by clicking one of the icons at the top.

Edit: This was a really bad idea because upgrading to 57 destroyed my sessionstore.js. None of the backups were up-to-date for some reason. Be careful and make backups!

Re:Firefox Quantum Lands in Beta, Developer Edition by jlgaddis on Tuesday September 26, 2017 @09:04PM (#15344075)
I'm just about to upgrade from 55 to either the Beta or Developer edition and was worried about this so thanks for the heads up! I probably would have anyways but now I'll be extra sure to back up my profiles first.