Firefox tabs numbering: Firefox add-on that numbers each tab in order to facilitate tab-switching to users who use keyboard shortcuts. Thought for i3 window manager users. https://addons.mozilla.org/en-US/firefox/addon/tabs-numbering/
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Remember: In Firefox, the keyboard shortcuts Alt + 1 through Alt + 8 allow you to switch to the corresponding tab from left to right. Alt + 9 will switch to the last tab, regardless of how many tabs are open. There’s no built-in keyboard shortcut to directly switch to tabs numbered 10 and above. If you need to navigate through a large number of tabs, you can use the following shortcuts:
Ctrl + Tab: This will switch to the next tab. Ctrl + Shift + Tab: This will switch to the previous tab.