[CentOS] What the heck is a "text/html decoder"

[Dennis Jacobfeuerborn]

On 04.11.2013 22:45, Frank Cox wrote:
> My phone service provider offers a way to check my voicemail via a webpage.  However, when I go to that webpage with Firefox and try to play back a saved message, a window pops up that says this:
>
> "The following plugin is required: text/html decoder"
>
> What is it looking for and how can I install it?  I already  have these totem rpms:

It's looking for a web browser. "text/html" is a MIME type:

http://en.wikipedia.org/wiki/Internet_media_type#Type_text

Regards,
   Dennis