Breaking into a browser isn’t as easy as it was a few years ago.
Back then, many browsers ran as a single monolithic process which could be taken over by finding and exploiting a single vulnerability.
That’s unusual these days, so this is an hacking story of considerable derring-do.
For those of you not up to speed on modern hackerspeak, the verb to pwn is a needlessly deliberate misspelling of to own. Pwning a system means penetrating it with an exploit or hack to the point that you acquire sufficient privilege to do pretty much what you want. It’s pronounced pone, and rhymes with hone, drone, clone and, of course, own.