Right-click on a banner and choose "Adblock" from the context menu - the banner won't be downloaded again. Maybe even replace parts of the banner address with star symbols to block similar banners as well. Or you select a filter subscription when Adblock Plus starts up the first time, then even this simple task will usually be unnecessary: the filter subscription will block most advertisements fully automatically.

Related extensions:
* Element Hiding Helper - http://addons.mozilla.org/en-US/firefox/addon/4364
* Filter Uploader - http://addons.mozilla.org/en-US/firefox/addon/4042

Winner of the "2006 PC World World Class Award", this tool provides extra protection to your Firefox.
It allows JavaScript, Java and other executable content to run only from trusted domains of your choice, e.g. your home-banking web site, and guards the "trust boundaries" against cross-site scripting attacks (XSS).
Such a preemptive approach prevents exploitation of security vulnerabilities (known and even unknown!) with no loss of functionality...
Experts do agree: Firefox is really safer with NoScript ;-)

FoxyProxy is a Firefox extension which automatically switches an internet connection across one or more proxy servers based on URL patterns. Put simply, FoxyProxy automates the manual process of editing Firefox's Connection Settings dialog. Proxy server switching occurs based on the loading URL and the switching rules you define.

Animated icons show you when a proxy is in use. Advanced logging shows you which proxies were used and when. QuickAdd makes it a snap to create new URL patterns on-the-fly. FoxyProxy is fully compatible with Portable Firefox, has better support for PAC files than Firefox itself, and is translated into more than 25 languages.

Retrieves a stripped version of the cached Google page for a URL, as well as a listing of Wayback's archived pages for the URL. In essence, it allows the viewing of a page, or site, without any active connections being made to the site.

Feature List:
- Turns on auto-updates
- Imports DoD Root Certificates from http://dodpki.c3pki.chamb.disa.mil
- Setup of CAC Reader driver
- Clarifies SSL error when Common Access Card (smartcard) not present (Firefox)
- Indicate when using trusted domain websites (.mil), similar to SSL (Firefox)
- Redirect to HTTPS when HTTP connection fails (Firefox)
- Sets up DoD LDAP Address Book (Thunderbird)
- Turns off image loading and javascript (Thunderbird)
- Setup of mail signing (Thunderbird)
- Looks at mail headers and warns if mail originates from outside of trusted domain (.mil) (Thunderbird)
- Selection of Threat Level (Thunderbird)

Upcoming Features:
- Add classification level selector (Thunderbird)

Setup Instructions:
After Firefox/Thunderbird is restarted to complete the installation, you will be prompted to add the CAC reader driver if you have the ActivCard/ActivIdentity software installed on your computer already. It should automatically setup the program to use your CAC card and add the device, choose OK. Next, it will install three DoD Root Certificate sets. Check all of the boxes for each one and select OK.

Show the IP address of the current page in the status bar. It also allows querying custom services by IP (right mouse button) and Hostname (left mouse button), like whois, netcraft. Additionally you can copy the IP address to the clipboard. This extension was formerly known as ipv6ident.