Is that feature being out-of-the-box, as opposed to available through an add-on, really that important? I love Tree Style Tab (https://addons.mozilla.org/en-US/

Is that feature being out-of-the-box, as opposed to available through an add-on, really that important? I love Tree Style Tab (https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/ https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...), but I don’t really mind that it’s not built in to Firefox. It’s easy enough to install on a fresh computer, and the default tab bar is useable enough for short periods. Anyway, as someone else said, setting browser.ctrlTab.previews to true in about:config should work. For me, it successfully changes the behavior of Ctrl-Tab to most-recently-visited order, and it causes hitting Tab while keeping Ctrl held to pop up previews of the tabs, just like Alt-Tab does on Windows. If you still can’t get that to work, there is also an no-restart add-on for what you want, MRU Tabs: https://addons.mozilla.org/en-US/firefox/addon/mru-tabs/ https://addons.mozilla.org/en-US/firefox/addon/mru-tabs/.