Comment 3 for bug 137993

Personally, I don't think that www browsers should be made recommendations and not dependencies.
Let me quote the debian policy:

The Depends field should be used if the depended-on package is required for the depending package to provide a significant amount of functionality.

While:

The Recommends field should list packages that would be found together with this one in all but unusual installations.

Now, I hope you agree that to provide a significant amount of functionality for this plugin a www browser is needed?

Whether it makes sense or not to add xulrunner to the list of dependancies (or-ed!) its a matter of testing it.
For instance, I have not added it to gecko-mediaplayer yet (from the same upstream author) simply because I don't have any evidence that it will work.
Just the fact that it makes sense that it works is not enough (for instance gecko-mediaplayer should work with Opera and Konqueror, but it doesn't).
Can you perhaps test it and confirm if the mozilla-mplayer works with xul based applications (via xulrunner)?