JShelter is a browser extension to give back control over what your browser is doing. A JavaScript-enabled web page can access much of the browser's functionality, with little control over this process available to the user: malicious websites can uniquely identify you through fingerprinting and use other tactics for tracking your activity. JShelter aims to improve the privacy and security of your web browsing.

Via la FSF

This extension looks at your current URL, and recommends BETTER product/service alternatives via an in-page pop-up.

Firefox pas ouf non plus.
L'occasion de commencer à aller voir ailleurs (Konqueror, ou qutebrowser pour lequel j'ai un onglet d'ouvert sur ses raccourcis clavier maintenant !)

via sebsauvage

Pimp my firefox!