Privacy & Security
Add a custom useragent string for desired URLs or domains.
Tamper Data Icon Redux Requires Restart
Open Tamper Data with a toolbar icon, an item in the Tools menu, or from an item in the Web Developer menu in 6+.
Adds button to show/hide password in input elements
Web Storage Viewer Requires Restart
View and manage the tracking data stored by websites on your system. This data is known by several different names: Web Storage, DOM Storage, HTML5 Storage, Session Storage and Local Storage.
SafeHistory Requires Restart
Restricts the marking of visited links on the basis of the originating document, defending against web privacy attacks that remote sites can use to determine your browser history at other sites. A link on a.com pointing at b.com will only be...
Use free web proxy to surf anonymously online, hide your IP address, and protect your online identity.
ShowIP Requires Restart
Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.
Blocks scripts (and more) on untrusted websites
Adds or removes parameters to/from URLs.
View Frames Requires Restart
View Frames in a tree in Page Info.
Passwordstate For Firefox is a free form filler extension that obtains credentials from Passwordstate.
Import and export your cookies and cookie permissions
The ultimate Productivity & ToDo list add-on,designed to personalize your browser experience while search the web from your NewTab
This is a very simple addon that disables the automatic loading of the regional version of blogs hosted in Blogger depending on the country's origin of the user. Sites like http://diegocg.blogspot.com.es will become http://diegocg.blogspot.com
No Google Link Rewrite add-on.
Disable HTTP Referer at Startup Requires Restart
Disable Send HTTP Referer at Startup everytime.
Interest-based advertising opt-out (by Google) Requires Restart
Opt out of Google's interest-based ads as you browse the web with Firefox.
Hide in the forest, with speculative pre-connections cleanly disabled.