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> set `xpinstall.signatures.required` to false

This seems to only work in the Nightly and Developer channel, not with the Beta channel. Is that correct?

I think, that is correct, yeah.

DevEdition is nowadays essentially just Beta with slightly different defaults (and that option compiled in), so you could just use that.

If you really do specifically want Beta, then Mozilla also supplies Unbranded Builds with that option compiled in: https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded...

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

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!

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.

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