I mean, it's making job pages for websites appear. That sounds like a simple task. But I tried with a couple of companies I knew were hiring, but had no easy to find menu item, and the extension just worked and took me there. It's pleasant!
I could see Cmd+Shift+J becoming part of the web browsing experience for freelancers: "Interesting product, do they hire?" -- and then there's your answer.
Getting me to the career pages of non-English sites didn't work as well, but I found the jobs page of English company websites that I didn't even know existed. Job well done!