The author of NoScript was part of way more meetings than me during the design of the WebExtensions API, so he would probably be able to tell you more about wha

The author of NoScript was part of way more meetings than me during the design of the WebExtensions API, so he would probably be able to tell you more about what happened to his add-on. I see a TreeStyleTab on AMO, so I guess it got ported: https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/ https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta... . It may have been harmed by the progressive disappearance of XUL, of course.