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You Can Now Try Firefox’s Vertical Tabs
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A place to discuss the news and latest developments on the open-source browser Firefox
I used the wrong word. I meant it can't be uninstalled (like an addon). It's just part of the browser. If this was an optional addon for people to uninstall or replace if they want, it would be fine. It's not the first time Mozilla did that, even outside of Firefox too.
Pretty sure LibreWolf will ship without the Ai. They normally remove invasive stuff before compiling rather than disabling it in a config later.