tchevalier

Plus, as an Open source model, if a security flaw is discovered, it's fixed in an average of one day, rather than other proprietary softwares can take weeks or months to fix it, for instance.

1. Adblock
2. Ghostery
3. Greasemonkey

Yes, these are my personal choices. The main reason for me is not privacy (I use Ghostery for that), but that I simply prefer a webpage without any ad. That said, as you note it, it may affect website revenues if everybody do the same, but I think they should change their business model (In fact, I don't really have to find them a way to earn money, I just have the right to load a page the way I want, and I want it without ads :) )

Absolutely, there is always things to do, and more important, no technical skills are required! https://www.mozilla.org/en-US/contribute/ As you can see, there is a lot of ways to contribute, you just have to choose an area of interest, someone will get in touch with you to help you to start your contributions

Indeed, Firefox Sync is really useful, and show its full potential when you use several computers and a mobile device. Yes, in the future, we will use Mozilla Persona (http://www.mozilla.org/en-US/persona/) our new identify system, which is easier to log in. Plus, it will be natively included into Firefox. But I don't know if it will replace the pairing procedure. BTW, our Sync feature is more secure than Chrome's one, because synced data are encrypted/decrypted by your browser itself, and even Mozilla can't decrypt them on their servers, only your Firefox on your device. Google can decrypt Chrome's synced data. So it's a choice to have a maybe little more complicated system, but it's truly secure.