How to Use SQLite Manager Extension in Firefox?

It was really strange when I installed an SQLite manager extension from Mozilla and I cannot find how to use it!!

Well Then I think there must be an icon, which I don’t see on tool bar.

Right click on the top of the Firefox, and choose customize.
Then look for the SQLite icon, drag it to toolbar. Click on the icon to use it.

Simple? I can’t say, because I find bit difficult!