they don't want people injecting javascript on their website. That's all there's to it. I'm not sending anything anywhere. I'm not storing anything. I'm not profiting from it.

> they don't want people injecting javascript on their website

They should send an email to every extension author ever, and maybe even browser vendors for supporting such a malicious feature.

...and then notify every ISP, every place that offers free public Wi-Fi, every airline that has Wi-Fi on their planes, anyone else who injects code into web pages...

But I do this already with an ad blocker…

Don't think they can enforce this at all, I would just change the name and call it a day. The burden is on you though, certainly no one can force you to make decisions. :)