I think you've linked the wrong "Block Site" extension, at least I couldn't find regex blocking or redirecting in that one, but this one has it: https://addons.

I think you've linked the wrong "Block Site" extension, at least I couldn't find regex blocking or redirecting in that one, but this one has it: https://addons.mozilla.org/en-US/firefox/addon/block-website/ https://addons.mozilla.org/en-US/firefox/addon/block-website...