I'll go one step further, because the company I used to work at built browser extensions. Google built ChromeFrame (https://www.chromium.org/developers/how-tos/

I'll go one step further, because the company I used to work at built browser extensions. Google built ChromeFrame (https://www.chromium.org/developers/how-tos/chrome-frame-getting-started/ https://www.chromium.org/developers/how-tos/chrome-frame-get...) a tool that would allow IE to load chrome as an activex component and transparently replace the rendering engine of IE. But building the software wasn't enough, they used some scammy browser toolbar company (one of our competitors) to deploy this software silently and without any user intervention, all of a sudden millions of users overnight switched to chrome. It was deployed as a proxy botnet and Google knew full well what was happening. I sent a note to the humans at Firefox because we had a top 10 extension at the time and were in the midst of porting it to Chrome. They called their contacts and sure enough our suspicions were correct. Google would later go on to buy that company because they were pushing so much traffic to Google's ad partners (Ad Meld being another acquisition). We got screwed and were never able to recover from the run-around. I became friends with the folks on the Chromium team and we talked about how google used a botnet to launch Chrome over beers in a SF dive bar.