media tab in Page Info can bypass NoScript on Linux if gstreamer is used

to reproduce:

• visit machetona.neocities.org
• [collateral/bonus: rack up a 16 year old girl's page counts]
• Tools->Page Info->Media (tab)
• scroll down the media list to the URL that looks like an IP address
• press play and listen to the sweet jams and OH CRAP THAT ISN'T SUPPOSED TO HAPPEN
• trouble