https://blog.mozilla.org/en/firefox/block-cryptominers-with-...
To help you combat these unwelcome scripts, we’ve partnered with Disconnect and compiled lists of domains that serve cryptomining scripts so you can block them directly through Firefox. When you download Firefox, tracking protection is enabled by default, blocking known cryptominers.
Technically true, but the list is mostly nonfunctional - cryptominers are basically extinct in the wild, and most of the domains on the list have expired or no longer serve mining scripts.