Depending on the version of your browser, you can see the following dialog where you need to press on "Install" button: or the following dialog where you need to press on "Add" button: If you selected an incorrect version of XPI file, FireFox would show an error message. And say goodbye to sluggish downloads and hello to a smoother, more efficient browsing experience. Starting from FireFox 8 Mozilla shows a confirmation dialog to install add-ons. Select idmmzcc2. IDM Scheduler.
nest...