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Took a look, it seems useless for manga - none of the extensions worked without challenging me to input a URL I had no basis for knowing.
The significantly more numerous anime extensions seem to include some that work a treat, though.
It’s based off Tachoyami(or whatever the one that was recently near nuked was called), and can be found googling a little. It’s annoying, but they got sued, and this was their way of protecting themselves.
Removed by mod
Thanks for the tip!