Firefox almost never bothers me for updates, and I have 3 plugins installed. But seriously, if it's your plugins that force you to do frequent updates, and that's a hassle, just remove the plugins.
Windows XP on the other hand, is teh pwn. I love it. Tried linux, tried 2k, avoided Vista like the black plague of hyped of bullshit that it is, and realized that XP is great. Yeah, it has flaws, specifically with networking, but I will admit that microsoft actually produced something good with it.