One of the greatest strengths of the Firefox web browser is its extensibility. This does not only include new features but also security enhancements that make the web browser more secure and less prone for attacks and privacy breaches.

The following list will contain Firefox add-ons that protect the user from various threats on the Internet. They have been divided into the categories Browsing, Cache, Cookies, Identity & Privacy, Passwords and Misc. Each link will lead to the Mozilla homepage that contains additional information and download possibilities.

All but one add-on should be compatible with the latest version of Firefox 3. Some of them are experimental add-ons that require an account at the Mozilla website before they can be downloaded and installed.

Browsing:

Blocksite - A customizable blacklist that blocks access to specific sites. It will also disable all hyperlinks pointing to those websites.

Bookmark Permissions - Stores five permissions (like enabled Javascript or Plugins) for every bookmark.

Customize Google - Customizes Google by adding and removing information automatically.

FlashBlock - Blocks all Macromedia Flash content from being loaded.

FoxFilter - Filters websites based on keywords. Ideal for parents who want to have more control over what websites are viewed by their children.

Ghostery - Displays information about tracking scripts on websites.

IDND - Informs the user if the domain name is an International domain name.

NoScript - Disables scripts automatically on the Internet with the option to enable them individually.

PhishTank - Adds extra phishing protection to Firefox.

Public Fox - Lock down add-ons, browser settings and downloads.

Redirect Remover - Removes redirects from links and images.

Secure Login - A one click login button that is similar to Opera's Wand functionality.

Show IP - Displays the IP of the current website in the browser.

Cache:

Cache Status - Cache Management from the Firefox status bar.

Passive Cache - Access the contents of a site without visiting it directly.

Safe Cache (FF2) - Segments the Firefox cache based on the source of the documents which defends against techniques to determine if a user visited another domain.

Cookies:

Add n Edit Cookies - Makes it possible to edit cookies.

Better Privacy - Adds Flash Cookie handling to Firefox.

Cookie Monster - Provides cookie management capabilities to allow and disallow cookies to be set on specific websites.

Cookie Swap - Use multiple cookies on one website.

CS Lite - Manage cookie permissions.

Identity and Privacy:

Adblock Plus - blocks advertisement on the Internet.

FoxyProxy - An advanced proxy management tool for the Firefox browser.

Goolash - The extension makes sure that a user is always logged out of Google accounts during Google search.

History Block - Can block sites from appearing in the browser's history.

MailCatch - A Firefox add-on to make use of a disposable email service that can be used to create emails to use on the Internet.

No Referer - Can block the referrer when accessing specific sites.

Private Browsing - Hides surfing trails.

Quick Proxy - Switch proxies on and off with one click.

Random User Agent - Replaces the default Firefox user agent with a random one.

RefSpoof - Allows to change the referrer on the fly.

Spam Advert - Another temporary email service that can be used in Firefox.

Stealther - Privacy browsing for Firefox versions that do not provide that feature.

Temporary Inbox - Another temporary email service that can be used to create disposable emails on the fly.

Torbutton - Adds a button to Firefox to enable or disable the anonymity software Tor.

Track me not - Protects the user against search data profiling.

Trashmail - Another one click temporary email creation service.

Passwords:

Last Pass - A secure password manager and form filler.

Mass Password Reset - Makes it easier to reset multiple passwords at once.

Secure Password - Secure password generation with the click of a button.

Show Passwords - Displays the passwords in web forms without asterisks.

Misc Extensions:

Controle de Scripts - Advanced settings for Javascript behavior in Firefox.

Febe - Firefox Environment Backup Extension can backup various Firefox modules such as extensions, options or themes.

Javascript Deobfuscator - Will inform the user about Javascript that gets loaded and executed on a website.

Javascript Options - A lite version of NoScript.

JS View - View the source code of Javascript files.

Long URL Please - Replaces short urls with their real destinations.

Quick Java - Quickly turn on or off Java with the click of a button.

Malware Search - Has been designed for HiJack This users who need to search for entries on the Internet.

Panic Button - Will perform an action like hiding all windows when pressed.

Remember Mismatched Domains - Adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows.

US Homeland Security Level - Displays the current US Homeland Security Threat Level in the web browser.

View Dependencies - Will display a list of all objects that have been loaded on the current website.

Yes Script - Can block specific scripts on a website. Basically the opposite of how NoScript handles it.

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