Add-on works as described. I'm enjoying the reviews written by people making thinly-veiled excuses as to why it's Actually Bad because they don't want to admit they enjoy the harassment of people other than themselves online, including totally original hits like:

- "waste of resources" (word replacers can be made in an afternoon by one experienced dev in their free time)

- "lolol imagine being incapable of handling a word, you should turn off the computer" (yet reviewer is incapable of handling letting a functional add-on exist without complaining despite there being plenty of other word replacers they don't care about, hmm - almost like they don't realize people are sick of seeing insults everywhere, so they have to frame it as a weakness/pull argumentum ad iram and call people "oFfEnDeD!11!" or whatever)

- "hurrdurr political virtue signaling it's a sign that Mozilla is going to die!" ("every cause/idea I don't like is virtue signaling so anyone who does it will go away soon because wishful thinking")

- "you can't shut everyone up" (when the add-on never claims to do this and isn't about this in the first place, as it's client-side and not server-side so it isn't silencing anyone...)

- single one-star review with no comment, i.e. "this is bad but I won't say why because I never even tried it and am bothered by its existence"

Not denying that companies can do more to attack the root of this issue, but I get the feeling that's not what these comments are really about.