These configurations can be applied to Iceweasel and Linux as well.
Just replace Tools > Options with Edit > Preferences
Firefox Security Config 2012
Tools > Options > Content > Check Block pop-up windows
Tools > Options > Privacy > History > Uncheck:
Remember visited pages for the last 0 days
Remember what I enter in forms and the search bar
Remember what i've downloaded
Tools > Options > Privacy > Cookies
Check Accept cookies from sites
Keep until: I close Firefox
Tools > Options > Privacy > Private Data
Check Always clear my private data when I close Firefox
Settings button: Everything should be checked in this window.
Tools > Options > Security > Check
Warn me when site try to install add-ons
Tell me if the site I am visiting is a suspected forgery
Tools > Options > Security > Passwords > Uncheck
Remember passwords for sites
Use a master password
Tools > Options > Advanced > Network > Cache
Press Clear Now Button
Set to Use up to 0 MB of space for the cache
Type about:config in the url bar.
Edit these settings to display:
browser.cache.disk.capacity 0
browser.cache.disk.enable false
browser.cache.disk_cache_ssl false
browser.cache.memory.enable false
network.cookie.enableForCurrentSessionOnly true
network.cookie.lifetime.days 0
network.cookie.lifetimePolicy 0
Manage Search Engines
Access this window from the search engine window.
Uncheck Show search suggestions.
Firefox security Add-ons
NoScript
https://addons.mozilla.org/en-US/firefox/addon/722
Firekeeper
http://firekeeper.mozdev.org/
Perspectives
http://www.cs.cmu.edu/~perspectives/index.html
Cert Viewer Plus
https://addons.mozilla.org/en-US/firefox/addon/1964
ShowIP
https://addons.mozilla.org/en-US/firefox/addon/590
Netcraft Toolbar
https://addons.mozilla.org/en-US/firefox/addon/1326
Cookie Monster
https://addons.mozilla.org/en-US/firefox/addon/4703
Remove Cookie(s) for Site
https://addons.mozilla.org/en-US/firefox/addon/1595
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