But these are only dirty tricks in the context of a monopoly. If they weren't a monopoly (which they were), it's just smart business. See Apple and Android today (Apple won't let AT&T put random AT&T software on the device. Android has blooked 3rd party competitive apps, like Skyhook, from being packaged with Android phones).
The toughest part about being a monopoly is that the regulatory agencies won't give you any guidance on what is "over the line" (Microsoft at one point went to the EU to ask if they did X, would that be legal. The EU said that they won't tell them. Try it and you'll find out.) You just have to do stuff and see if you get sued or not.
The whole system of a corporation owing only to its shareholders demands this "do stuff and see if you get sued" mentality. The Mozilla foundation, being a non-profit doesn't need to bully anyone into submission. But that's besides the point, as I think today whatever race there is to browser dominance is not driven by the notion that "win the war, win the market", but by a more sensible notion, and therefore I hesitate before I call the situation today a "Browser War".
The toughest part about being a monopoly is that the regulatory agencies won't give you any guidance on what is "over the line" (Microsoft at one point went to the EU to ask if they did X, would that be legal. The EU said that they won't tell them. Try it and you'll find out.) You just have to do stuff and see if you get sued or not.