[severine]

I have installed it and it doesn't work.

In the Mozilla addons page it just says "Pinpointer error".

In this HN page, it prompts me to select and click a green button, but fails to do anything.

It's an interesting concept, keep going!

edit: Firefox 62.0b9 (32-bit) in up-to-date Ubuntu 16.04, with uMatrix and other extensions running.

[Rumperuu]

As far as I can tell the Mozilla addons page doesn't like addons running on it. I'll add a more explanatory error message though. I hadn't thought to test it on HN, so that's intriguing. I'll look into it, but I'd presume it's due to some sort of quirky DOM structure.

[ChrisGranger]

There's an about:config entry regarding this.

extensions.webextensions.restrictedDomains

[severine]

(Self-reply) It worked in the next page I tried:

https://www.metafilter.com/175389/None-Dare-Call-It-Treason#...

[eat_veggies]

Content scripts are disabled on addons.mozilla.org