(BCM43 is right that none of us at Mozilla have any reason to complain about ex-Mozillians and others helping to increase competition on the web.)
Why would Mozilla want to put up a fight? It seems to me that One of Mozilla's biggest goals is working towards a better web, and that chrome as done quite a bit for innovation in the browser market.
I'm not saying that Chrome is going to become the IE6 of 2015, but if there is ever a point where Chrome can either do what is best for the web/user or be better for Google's bottom line they will always be choosing the latter.
Look at the state of flashblock and adblock in Chrome. It may have changed, but when I last looked at them they were both complete crap compared to their firefox equivalents. Google has very little incentive to improve their plugin system to make them more effective, but that would be counterproductive to what they are trying to achieve. I wouldn't be at all surprised if there comes a point when they are trying to push alternate formats for streaming video over Flash and it will suddenly become very easy to block Flash effectively and efficiently in Chrome.
I use Chrome and I like it, but I generally trust Mozilla to push for the best things on the web than any for-profit company, even Google.
That is exactly what happened. That's how Firefox was born if you remember. IE6 was dominant and Firefox rose from Netscape's ashes to challenge it and it turned out to be a very good thing.
In the payment business it's often the relationship with the merchants and processors, understanding how they work is even more important than the code or even the hardware. People are key in that business.
Forget about the industrial espionage, just hire a person who knows all the trade secrets. If PayPal and Google were a country there would be dead bodies on the streets of San Francisco.