I use [https://addons.mozilla.org/en-US/firefox/addon/all-tabs-helper/?utm_content=addons-manager-reviews-link&utm_medium=firefox-browser&utm_source=firefox-browser All Tabs Helper] Unfortunately, it's no longer being supported, and as such, there's couple new features/improvements/bugs that won't be addressed. I'm hopig there is another app out there that can perform some of the same tasks. It can be displayed from a toolbar drop down menu. I prefer it in the popup window mode (see image) I find taht popup window particularly useful when there's a ton of tabs, being able to far more conveniently scroll thru your tabs as if they were files in a "File Explorer" type of directory environment, with, for instance, the ability to search, move/close tabs, in bulk, if you wish. Another nice feature is a 'CSS" field in the settings to customize the interface, i.e. make the fonts bolder & alter their size. It's supposed to open up to the active tab, but that's one of the things that no longer work, as well as other issues.