That's not the entire reason. Firefox defaults to Google as the front page and as the search engine. Unlike Chrome, it doesn't even ask if you want to use a dif

That's not the entire reason. Firefox defaults to Google as the front page and as the search engine. Unlike Chrome, it doesn't even ask if you want to use a different search engine. Of course AdSense is a part of it. But assuming that they needed to invent a browser just to get AdSense revenue is stupid. There's more to Google's strategy to that. Docs: again, it's not just AdSense. It's letting Google index more. It's giving them primary control over content. No surprise Docs lets you publish directly to BlogSpot. It's all about keeping it in Google and giving it primary access to indexed material.