Firefox users criticized the permanent ‘List All Tabs’ button introduced in version 131.0, leading Mozilla to make it removable.
The button, designed to manage hidden tabs and prevent add-ons from hiding them, received backlash for being unnecessary alongside Firefox View.
Mozilla responded with a fix in version 131.0.3, allowing users to remove the button through toolbar customization.
Just brainstorming, but you can put a js cryptominer in the background, and then leave it open but hidden. Or load ads, but not actually show them to the user. Probably neither of those use-cases are allowed by addons.mozilla.org TOS, but what they don’t find, they can’t moderate.