Comment by Sesse__

> I think he's saying that building a browser is not a transferrable skill, like making a generic web page is. Employers don't like specialists.

I recently switched roles, and among the seven places I interviewed, none of them seemed to see my then-current browser job as a problem, even though they were not related to browsers. (The closest one was a company implementing a HTTP reverse proxy, and I did not work on the browser's HTTP stack.)