MultiSelect Tabs
This add-on is no longer maintained! Firefox 64 is introducing built-in multi-select tabs, so just use those instead. Source: https://github.com/mikeconley/multi-select-tabs
This add-on is no longer maintained! Firefox 64 is introducing built-in multi-select tabs, so just use those instead. Source: https://github.com/mikeconley/multi-select-tabs