New Brower Session on IE8/IE9 and Google Chrome

IE8 or IE9 (Microsoft Internet Explorer)
Use -nomerge switch when running IE.

Google Chrome (V12.0.742.124)

• Use Ctrl + Shift + N to bring up a new Chrome window in the Incognito mode (private browsing). However, any subsequent window opened up this way will share the same session.
• Use --user-data-dir switch with different profile locations when running Chrome. A bit awkward but can be mitigated by using shortcuts. However, each session will its own config and cache. For example,

google-chrome --user-data-dir=/home/tom/chrome-profiles/1
google-chrome --user-data-dir=/home/tom/chrome-profiles/2
google-chrome --user-data-dir=/home/tom/chrome-profiles/3

Refs
http://superuser.com/questions/690/new-browser-session-on-firefox-and-google-chrome

Browser Cache Location in Ubuntu

FireFox
~/.mozilla/firefox/Cache

Google Chrome
~/.cache/google-chrome

Opera
~/.opera/cache

Refs:
http://superuser.com/questions/223774/google-chrome-and-firefox-cache-in-ubuntu