Seems like Tree Style Tabs got ported to the WebExtensions version now! It still can't hide the tab bar (API will come in later releases) but it works! https:/

Seems like Tree Style Tabs got ported to the WebExtensions version now! It still can't hide the tab bar (API will come in later releases) but it works! https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/ https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta... There's also the Tree Tabs extension which I don't like as much.