Necessary script for frame not shown in the matrix

On this site
http://www.spiegel.de/kultur/musik/keith-jarrett-neues-album-last-dance-im-vorab-stream-a-973857.html
there is a frame containing a music stream. When I loaded that site the matrix only showed me to whitelist the frame cell for player.muzu.tv. After that I had to reload the site several times and had to whitelist the plugin cells for damoh.muzu.tv, player.muzu.tv, media3.muzu.tv and static.muzu.tv and the script cell for files.muzu.tv. (I didn't whitelist the complete muzu.tv domain.)

The interesting thing is that I also have to whitelist the script cell for player.muzu.tv although this cell is empty. It doesn't contain any number. Once I blacklist that empty cell again, the stream stops to play.

[gorhill]

Ok, two problems:

1. When injecting a script at document_start, the DOMContentLoaded event is never fired, hence the frame content can't be analyzed and reported. So I will have to go back to split the injected content script into two scripts.
2. The test against pageStats.pageScriptBlocked is naive, need to use the result of the evaluation of script for the location URL.