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JS Switch Requires Restart

Add a toolbar button or an option in Tool menu to toggle JavaScript

Rated 4 out of 5 stars (20)
7,767 users

JS Switcher

Turns on and off JavaScript

Rated 1 out of 5 stars (2)
270 users

JSOff

Disable and enable JavaScript using a simple toolbar button.

Rated 4 out of 5 stars (18)
3,666 users

Just Disable Stuff

Just disable JavaScript - toggle it on and off. No fancy toolbars, icons, windows, unnecessary functions. Just do it. You can also disable images. Just like that.

Rated 4 out of 5 stars (17)
27,774 users

Just Redirect!

Get to the destination url without any page in the middle attacks.

Not yet rated
0 users

kabotya Requires Restart

proxy(gae and dotcloud)/google link remover

Not yet rated
2 users

Karma Blocker Requires Restart

Block resources based on their karma.

Rated 4 out of 5 stars (87)
6,673 users

Kaspersky Fraud Prevention for Mac

This is the Kaspersky Fraud Prevention Extension

Rated 2 out of 5 stars (1)
53 users

Kaspersky Password Manager for Mac

Stores your logins, passwords, and other important information, protecting them with a master password.

Not yet rated
374 users

KDAF Requires Restart

KDAF stands for Knowledge-based data access in Facebook.
This extension gives user the ability to distinguish friends on the degree of friendship. You can encrypt private data with private information only your real friends know.

Not yet rated
2 users

KDE Wallet password integration Requires Restart

This is an extension that allows firefox use kde's kwallet password manager to store passwords.

Rated 4 out of 5 stars (127)
1,404 users

KDE5 Wallet password integration Requires Restart

This extension enable passwords and form logins to be stored in KDE5 Wallet

Rated 4 out of 5 stars (16)
927 users

KeeFox Requires Restart Featured

Simple and secure password management. Login automatically, never forget another password, stay in control of your passwords and improve their security. Powered by the world-renowned KeePass Password Safe.

Rated 5 out of 5 stars (1,201)
64,528 users

Keep Until Closed

Add-on to assist with the 'keep cookies until closed' lifetime policy.
Adds a single button to allow the current tabs cookie to survive a browser restart.

Not yet rated
21 users

KeePass Helper Requires Restart

Adds a hostname, URL, or email account ID to the application's window name (e.g., that of Firefox or Thunderbird) to make it recognizable to password manager utilities like KeePass.

Rated 4 out of 5 stars (35)
4,915 users

Keeper® Password Manager & Digital Vault Requires Restart

Keeper protects you against hackers with a secure and convenient password manager. Your passwords, logins, credit card numbers, bank accounts and other personal information is saved in your private digital vault that is encrypted and unbreakable.

Rated 4 out of 5 stars (18)
7,387 users

Keksmonstrum

Isst Kekse.

Not yet rated
5 users

Key Manager Requires Restart

KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation

Rated 3 out of 5 stars (21)
835 users

Keychain Services Integration Requires Restart

Store usernames and passwords in your Mac OS X Keychain.

Rated 4 out of 5 stars (86)
4,133 users

Keylogger Beater Requires Restart

Use it to keep your username or password from being stolen by a keylogger.

Rated 4 out of 5 stars (12)
1,346 users