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Not yet, since we're first focused on an MVP. It's something we do have in mind for our roadmap!

How difficult is it to maintain both browsers compared to only one?

Not particularly challenging. There's a couple small things you have to add to the manifest usually, but no big deal.

I might actually submit a PR for Firefox support in a day or two if I get around to it.

that would be awesome! Let us know if you have any questions, happy to help you get onboarded.