That's good news. Hopefully this also will allow something like Tree Style Tab [1] or at least make it a lot easier to build such an extension. [1] https://add

That's good news. Hopefully this also will allow something like Tree Style Tab [1] or at least make it a lot easier to build such an extension. [1] https://addons.mozilla.org/de/firefox/addon/tree-style-tab/ https://addons.mozilla.org/de/firefox/addon/tree-style-tab/