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I want to assign an extension action to Alt + T but even though it's set properly, Firefox is still overriding it and showing its own mini menu instead of activating the extension action.

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How do I disable this behavior?

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Firefox is still overriding it and showing its own mini menu

That's because Firefox uses alt as a shortcut to open the menu bar and alt+t will open the tools menu.

There are a couple of potential fixes.

How to disable menu popping up when I press ALT key

You can set the ui.key.menuAccessKeyFocuses pref to false on the about:config page to prevent opening the menu when holding down the Alt key. This may require to close and restart Firefox.

ui.key.menuAccessKeyFocuses = false 

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

Source: How to disable menu popping up when I press ALT key

If you still wants access to the menu bar you can change the shortcut uses to open it:

How to disable menu bar navigation via alt+_ key shortcuts?

set ui.key.menuAccessKey = 17 on the about:config page. This makes the menu bar work with Ctrl+Shift.

Source: How to disable menu bar navigation via alt+_ key shortcuts?

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  • Amazing, I didn't even know the popup was coming from the menu bar since I thought it was inactive when hidden. I just thought it was a random quick access menu of sorts. Nov 12, 2022 at 5:13
  • Just an update, ui.key.menuAccessKeyFocuses set to false with a browser restart did not work. What DID work was setting ui.key.menuAccessKey to 0 Nov 12, 2022 at 5:20

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