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In order to change your default web browser to Mozilla Firefox simply follow these steps:
Step 1: Open Your Firefox browser select tools and select options.
Step 2: A new window opens select advanced tab at the bottom you find system defaults select "Always check to see if Firefox is the default browser on start up" check-box.
That's all Your work is done.
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Step 1: Go to the folder where the file you want to play is stored. Now right-click on the file and choose Open With and then click on Choose Program.
Step 2: Now select the program you want to use to open the media file and make sure to check the Always use the selected program to open this kind of file box.