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@SuperDicq
There is also powxy https://forge.lindenii.runxiyu.org/powxy/-/repos/powxy/ which gives you the challenge and tells you to find out the nonce on your own if js isn't working.

Here is a website that appears to be using it https://git.vitali64.duckdns.org/ (disable JS before visiting so that you can check it out with its full glory), the challenge page also have links to some offline solvers that you can use.

It doesn't seem to have an addon but I would expect that implementing is easy (I am not an expert though so idk)