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Any plans for Firefox (and does this need to be an extension at all - there are some rather powerful website extensions that load via JS scripts)?

Yup. The code was written with portability in mind. As soon as I get time to test it on Firefox I'll do it.

And have you thought about whether or not it could be loaded with javascript?

That could eliminate the need for platform specific extensions.

There's a service worker in the background that does quite a bit of the heavy lifting. So, it can't be a pure JS script.