+1/•

nice

Good tool for security and dealing with numerous accounts when performing administration for a group of clients.

Instead of open many windows like Chrome, this extension make me feel a bit control because it's happened in ONLY ONE windows.

The best addon ever, convenient tabs and seamless proxy support

This is a must have for me and the reason I still use Firefox. The ability to have my email open in one tab and my administrator account in another tab is just one example of why I love this extension. All web browsers should support this by default.