You can read more about the decision to remove it on Mozilla's Bugzilla [0]. There are extension providing pretty much the same experience, like Panorama view

You can read more about the decision to remove it on Mozilla's Bugzilla [0]. There are extension providing pretty much the same experience, like Panorama view [1]. I agree that it's very convenient to separate tabs into separate topics, and only view the ones that are relevant at any time. [0] https://bugzilla.mozilla.org/show_bug.cgi?id=1222550 https://bugzilla.mozilla.org/show_bug.cgi?id=1222550 [1] https://addons.mozilla.org/en-US/firefox/addon/panorama-view/ https://addons.mozilla.org/en-US/firefox/addon/panorama-view...