This narrows the possibilities down to three four interesting options.
Mozilla did this, and you’re the first person to talk about it online
Your OS did this, and you’re the first person to talk about it online
A protected browser page got hijacked by malware on Linux
You did this and forgot, somehow
Some other comments have been annoyingly dismissive, but I hope you push onward to figure out what the hell this is. Because if it’s one of the first two, it’s a big deal.
You probably downloaded some shitty addon, or installed firefox from the wrong source
This was installed however the fuck endeavour installs Firefox
This? https://endeavouros.com/
Yep
This narrows the possibilities down to
threefour interesting options.Some other comments have been annoyingly dismissive, but I hope you push onward to figure out what the hell this is. Because if it’s one of the first two, it’s a big deal.