How to stream RealPlayer in Firefox

Slightly modified from the built-in help inside of Firefox, to access this you can press F1 or choose Help>Help Contents from the menu

Best Regards,
Williamts99

To open this dialog, select Edit > Preferences,
 select the Content Tab, and click the Manage button in
  the File Types section. You can change the action for a file type or
  remove it.
  More information about this dialog is available in File Types.

When you click on a file and Firefox doesn't know how to handle it,
  an Opening dialog box is displayed, offering these choices:
    * Open with: Firefox opens the file using the
          default program in your system settings. You can also choose a different
          program by selecting Other... in the drop-down list.

    * Save to Disk: Firefox allows you to select a
          location to save the file. If you have selected Save all files to (this
          folder) in the Main panel of OptionsPreferences,
          the file will automatically be saved to the default folder; otherwise
          Firefox will ask you where to save it.

    * Do this automatically for files like this from now on:
          When this is selected, Firefox will automatically perform the
          selected action the next time you download a file of this type.

Tip: You can clear your saved optionspreferences for Do this
  automatically for files like this from now on in the Download
  Actions dialog.