Have you installed RealPlayer a couple of days?
Now, YouTube prompts their videos with the following error message:
An error occurred. Please try again later.
To fix this, just follow these simple steps:
- Open RealPlayer.
- From the upper left corner menu, choose Preferences option.
- From the left hand panel, choose Download & Recording.
- Uncheck “Enable Web Download & Recording for these installed browsers”.
- Hit Ok to confirm and close RealPlayer.
- Restart Mozilla Firefox.