Sadly yes, but the alternative is a browser that trackers you and that allows ads to also track you.

By default that's what FF does too, that's presumably what Google pay Mozilla hundreds of millions for.

Yes, but so does Chrome.

In that regard, Firefox is not a worse option, just equally suboptimal.

It does? But I'm using add ons that I made on Chrome that I haven't registered or signed anywhere. I thought Firefox disallows that?

Signing is pretty important. Without signing anybody could surreptitiously replace your addon with something else.

How so? Either they already have access to my computer, in which case browser addons are the least of my concerns, or they've compromised Mozilla in some way in which case who's to say they can't sign their fake addon too?

But it also means that I can't have an add on that Mozilla doesn't sign, right?

Only if they have local access. In which case, I’ve already lost.

The Developer Edition of Firefox allows one to turn off the add-on signing requirement.