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Firefox has multiple tab grouping extensions. And Mozilla independently checks the code of its top 3rd-party add-ons for safety.

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They can't interact with the top tab bar after Mozilla switched to Webextension, so you're usually left with an awkward, secondary panel.

The top tab bar in Firefox can be disabled:

<https://support.mozilla.org/en-US/questions/1417387>

It will pretty soon be possible to turn off top tabs in Firefox without this kind of userChrome jiggery-pokery. The sidebar API has been updated in Firefox Nightly 131, and it provides a side tab bar, and the ability to disable the top tab bar. Existing sidebar tab extensions will be able to update to this API.

That would be progress, thanks.

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