How to use Internet Download Manager In firefox 4.0 & later version

First of All Install Internet Download Manager. Then open Mozila Firefox and Do following:

1. Go to tools->Add-ons & Search FlashGot
2. Install that extension.
3. After Installing Goto tools->Add-ons->Extensions->FlashGot->Option.
4. In option->General->Select Download manager ->Internet Download Manager
5. FlashGot Media -> Add Download Manager -> Internet Download Manager

Thats it. enjoy Fast Downloading.........