Most of the trouble Mac users have with Web browsing — if they’re not using OS X — doesn’t bother PC users at all. You see, since Microsoft abandoned the Mac platform entirely, and since both Safari and Firefox will NOT run on Mac OS 9 or earlier, using the Web on an older Mac is a major crapshoot.
Not so for Windows PCs, where Internet Explorer 6 (surprisingly good) and Firefox 2 will both run on Windows 2000 and 98. Minimum specs for Firefox are Windows 98 with 64 MB RAM and a 233 MHz processor, with “recommended” specs being Windows XP, 500 MHz processor and 256 MB RAM.
I’m not sure which Firefox version I have on This Old PC, but I’m right on the edge — in between the minimum and recommended specs with a 333 MHz processor, 262 MB RAM (although I’ve two 128 MB SIMMs and one 64 MB SIMM on the mother board — that’s all it will address) and Windows 2000.
Firefox 22.214.171.124 is still available for the rest of us and will be “maintained with security and stability updates until April 24, 2007.”
Internet Explorer 6, the minimum system requirements are: 486/66 MHz processor (Pentium recommended), Windows 98 or 98se, Me, NT 4.0 with SP6a and higher, 2000 and XP. Memory: 16 MB for 98 and 98se (oy!), 32 MB for ME and 2000 and XP. Trust me, you want more power than this, but it will work.
So between these two browsers, especially IE 6 — which I predict has a few years of MS support left in it — there’s a lot of hope for your older PC in terms of general Internet browsing.