Firefox: no, its not the end all solution, it has its own issues and in time it will be just as insecure as IE, when its hit Firefox 6, if it makes it that far. Oh, and AOL pays for it, incase you didn't know.

Microsoft & Windows: If you hate it so much, move to linux, or bsd, or anything else, stop complaning and move on.
Good starting places: Gentoo Novell SUSE Fedora Core Apple