Flash player does not load / Error 301: Unable to load plugin with Firefox

June 20, 2012 2
 Para Español, de clic aqui


Flash content does not appear, the NetroMedia player is blank with no controls or displays errors such as "301: Unable to load plugin: unable to load plugin ‘controls’, url: ‘flowplayer.controls-3.2.5.swf’", or Flash video will not function properly.


If RealPlayer is installed on your system, please disable the RealPlayer Browser Record plug-in.

Here’s how:

  1. Launch RealPlayer
  2. Click the RealPlayer icon in the upper left corner of the window and choose Preferences.
  3. Choose Download &Recording from the left hand panel
  4. Uncheck "Enable Web Download &Recording for these installed browsers"
  5. Click OK and close RealPlayer
  6. Restart Firefox