Addons Memory Usage - Button 的图标

Addons Memory Usage - Button 1.2 需要重开

作者: intika

Add toolbar button for about-addons-memory-pm

But not only, also provide shortcuts for :

- Free Memory (needs free memory button)
- Abouts list page (about:about)
- Plugins page (about:plugins)

github.com/intika/about-addons-memory-pm