The steps are:
1 . Download the file IDMCC 7.3.61.
2 . Open your browser "Mozilla Firefox".
3 . Press Ctrl + O.
4 . Dialog box appears , navigate to the file that has been downloaded (idmzcc.xpi) .
5 . Press Enter or Open .
6 . Dialog box will appear , click install now .
7 . Once the install is complete , you restrat Mozilla Firefox .
8. Complete , the IDM is ready for use .
Link Download :