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.
What is TabToggle?
TabToggle is a Firefox add-on by Sriram. This add-on has 104 daily active users and a good user rating of 4.83. The latest version, 1.0, was updated 5 years ago.
Rating: 4.83 (6)
Version: 1.0 (Last updated: 2018-01-06)
Creation date: 2018-01-06
Weekly download count: 1
Firefox on Android: Yes
Manifest version: 2
Risk impact: Moderate risk impact
Risk likelihood: Low risk likelihood
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Other rankings#14 in toggle keyword #246 in database keyword
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)
TabToggle requires some risky permissions and may not be safe to use. Exercise caution when installing this add-on. Review carefully before installing.
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TabToggle has earned a fairly good reputation and likely can be trusted.
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Exactly what I needed. Firefox should include this functionality by default, and should allow you to select what hotkeys to use (ALT+Q is perfect)