I find it rather odd that Googling "uBlock Origin" from Firefox does not return links to addons.mozilla.org - at all. The top result is of course the Chrome addon. The third result is the website for "uBlock" which is the unmaintained fork. Three pages in and you're getting dubious-looking repackaging sites, but no official addon.

How on Earth does "Comorbidities Associated with Plaque Psoriasis | Dermatology Times" on page 10 have a higher PageRank and relevance for the search query "uBlock Origin" than https://addons.mozilla.org/en-US/firefox/addon/ublock-origin... ?