TabToggle：A port of Tab Toggle by firesofmay legacy addon to Firefox Quantum and higher versions Pressing ALT-Q will switch to previous tab. Repeating this will toggle between two tabs...
This addon is meant to help toggling between 2 active tabs back and forth with a click/keyboard shortcut
Highlight 2 active tabs (of the same window) by clicking on them. The addon keeps tracks of the last 2 active tabs dynamically.
Clicking on the Toggle button (or Alt+Q shortcut) toggles the active tab.
The addon is just a naive port of the legacy addon with the same functionality (by firesofmay)