I don't believe it's abuse of the term, it's not part of Firefox's source code -- as far as I'm aware it's literally a web extension that's batched in after bui

I don't believe it's abuse of the term, it's not part of Firefox's source code -- as far as I'm aware it's literally a web extension that's batched in after build time. It also exists in isolation with exactly the same featureset on the demo link on that README page. With regards to "written by the same team", from the same file: > PDF.js is community-driven and supported by Mozilla. Glancing at the contributors, the vast majority of the additions have come from (in order of most to least) a Google developer, an unidentifiable internet rando, two mozilla devs and someone who works for a Dutch IT firm.