Ghostery doesn't detect tracker inside a frame structure website.
Take http://www.sustainable.webuda.com for example, ghostery found google anaytic tracker.
when I surfing the same website via another uri below where it embedded, ghostery cannot found the google anytic tracker.
source code of it:
CHAMP2Hi bobcaonjut, thanks for using Ghostery.
This is a known issue. Ghostery scanning and blocking are separate sub-programs. When a frameset is used on a web page, Ghostery sometimes looses handle on the top frame (additionally, top frame i sometimes not reported by Fx core). When this happens, Ghostery scanner does not associate bugs found with the top frame of the site. However, Ghostery blocker does not need to know which site a bug came from to block it effectively. If you have blocking on, and Ghostery missed your bug on a page, you may also check Ghostery's Block Log in Fx toolbar -> Tools -> Ghostery -> Block Log.
Last note: I was unable to see any GA trackers on the forum sites listed above.