Strike that. As soon as I tried to make a comment on Facebook, it crashed. I'm installing chromium and we'll see how that works.

Though, I can navigate and leave facebook open without it destroying my browsing session and I'm not getting the hangups anymore.

What you describe sounds like a problem with the flash plugin, try running without flash and see if you can still reproduce the problem.

NO flash issues here using:
$ apt-cache policy flashplayer-mozilla
flashplayer-mozilla:
Installed: 2:10.3.181.26-0.1
Candidate: 2:10.3.181.26-0.1
Version table:
*** 2:10.3.181.26-0.1 0
500 http://www.debian-multimedia.org/ unstable/non-free i386 Packages
100 /var/lib/dpkg/status


iceweasel:
Installed: 7.0~a2+20110715042002-1
Candidate: 7.0~a2+20110715042002-1

or when using:

My Firefox Information

Last updated: Thu, 28 Jul 2011 21:47:01 GMT
User Agent: Mozilla/5.0 (X11; Linux i686; rv:5.0) Gecko/20100101 Firefox/5.0

Extensions (enabled: 18, disabled: 3; total: 21)

• Adblock Plus 1.3.9
• BetterPrivacy 1.51
• ChatZilla 0.9.87 [disabled]
• CoLT 2.5.2
• feedly 5.5
• FireFTP 1.99.4 [disabled]
• FlashGot 1.3.0.4
• HTTPS Finder 0.69
• HTTPS-Everywhere 0.9.7
• InfoLister 0.10.4a2
• Konquefox 1.7.5
• MAFIAAFire Redirector 0.7b
• Movable Firefox Button 1.3
• Nightly Tester Tools 3.1.7
• NoScript 2.1.2.4rc6
• OptimizeGoogle 0.78.2
• Oxygen KDE Options 3.3
• PDF Download 3.0.0.2 [disabled]
• PlasmaNotify 0.3.2
• Stylish 1.2
• Torbutton 1.4.0

Themes (3)

• Default
• Firefox B [selected]
• Oxygen KDE [selected]

Plugins

• Adobe Reader 9.4
• DivX Browser Plug-In
• Google Talk Plugin
• Google Talk Plugin Video Accelerator
• Helix DNA Plugin: RealPlayer G2 Plug-In Compatible
• Java(TM) Plug-in 1.6.0_26
• mplayerplug-in is now gecko-mediaplayer 0.9.9.2
• OpenOffice.org Plug-in
• QuickTime Plug-in 7.6.4
• RealPlayer 9
• Shockwave Flash
• Windows Media Player Plug-in