The extEMM extension for Firefox is a power button for your browser. No, it will not give you super strength or flying abilities, I’m not talking about those powers. I mean – well, this is how the developer put it.
This extension adds a menu button to Firefox allowing the user to restart or close Firefox and re-open with the current tabs. The session is even saved through a reboot. This is a small extension that uses Firefox’s internal session save features, light and fast.
The button is small, but the functionality behind it is huge.