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If you don't, then the time you lose your job and/or have some serious medical problem you'll be in a real trouble.
* Magnetic borders for window management
* Focus follow the mouse (window management again)
* Virtual desktop (yes, OSX has it and some third party tools on Windows, but they're not as good as X's virtual desktops)
Each time I have to use a Windows machine, I suffer because of the usability of the GUI. (And the command line too, but I can't really blame Windows or OSX for having a command line that sucks - it's not important for their target demographic).
2) They're not paying Mozilla "to be nice", but because Mozilla is bringing them visitors. It's a simple business contract, in which both parties are benefiting.
Now, if Google decided not to renew the contract after it expire, Mozilla may be able to find an other partner. It may hurt them or not to work with a service different from Google.