Add-ons

User Agent Switcher by chrispederick

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

StartupMaster by htamas

Asks for the master password at startup (fixes multiple password prompt)

RequestPolicy by Justin Samuel

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

TrayHotKey by zbinlin

为Fx5.0 及以上版本提供系统热键（老板键）功能

Collector's Note better than other bosskey like addons

Master Password+ by V@no

Various enhancements for build-in "master password" (MP)
-Locks master security device on demand or after specified time
-Prompts for MP on browser startup
-Suppresses all or duplicate MP prompts
-Locks up entire application or individual windows

RefControl by James Abbatiello

Control what gets sent as the HTTP Referer on a per-site basis.

YesScript by Jason Barnabe, Andras Horvath

A JavaScript blacklist

Private Tab by Infocatcher

Adds private tabs.

WorldIP - Geo Add-on with Security Features by Alrond

Professional Geo Add-on with security features and advanced network tools. Anti-phishing. Protection against DNS spoofing and fake sites. All DNS records for domain. The real location of web server, country flag, extended information about datacenter

Silent Block by Schuzak

Minimum and fast URL blocker.

QuickPasswords by Realraven (Axel Grude)

Retrieve your Passwords the quick way! Never retype or display your secure passwords on screen anymore - put the password where you need it - the login form or the clipboard.

Now also includes SSO change (multi-domain pw) and Backup + Restore.

Certificate Patrol by Carlo v. Loesch, tg(x), others

Your browser trusts many certification authorities and intermediate sub-authorities quietly, every time you enter an HTTPS web site. This add-on reveals when certificates are updated, so you can ensure it was a legitimate change.

Google Privacy by Herrminator

Make some popular websites respect your privacy settings.
Please see the known issues below!

URLFilter by Vasiliy Temnikov

Block advertisement and access to adult sites

Fox Web Security by Oleksandr

Protection from adult content (parental control) and from dangerous sites.
Entrust protection for yourself and your children to professionals!