Will I be able to run Firefox 3.0, 3.5, or 3.6 on it? Grin
You'll be able to run [i]some[/i] sort of Firefox on it. Not sure what version. Don't think it matters though.
What does DSL have?
XMMS (MP3, CD Music, and MPEG), FTP client, Dillo web browser, Netrik web browser, FireFox, spreadsheet, Sylpheed email, spellcheck (US English), a word-processor (Ted), three editors (Beaver, Vim, and Nano [Pico clone]), graphics editing and viewing (Xpaint, and xzgv), Xpdf (PDF Viewer), emelFM (file manager), Naim (AIM, ICQ, IRC), VNCviwer, Rdesktop, SSH/SCP server and client, DHCP client, PPP, PPPoE (ADSL), a web server, calculator, generic and GhostScript printer support, NFS, Fluxbox and JWM window managers, games, system monitoring apps, a host of command line tools, USB support, and pcmcia support, some wireless support.
http://damnsmalllinux.org/
Or, like I said, run a firewall router with it. http://www.smoothwall.org/