4 ms·
Could be Tree Style Tabs (https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/ https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...) or Tab
by isxek 10y ago
Could be Tree Style Tabs (https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/ https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...) or Tab Tree (https://addons.mozilla.org/en-US/firefox/addon/tab-tree/ https://addons.mozilla.org/en-US/firefox/addon/tab-tree/).