Generally excellent but just reporting that the last update a week or so ago is breaking many web sites and hanging Firefox downloading of content. I have tried disabling add-ons one by one and Ghostery is the culprit. Parts of pages (content files for frames, CSS, JS, etc) are being stopped (leaving the page incomplete or corrupt) but, if you reload (smetimes have to do this 2 or 3 times) they then often load. Other sites, not loading any trackers being stopped (so Ghostery reports clean) error with Ghostery enabled but load OK with it disabled. There is evidently some bug in the recent update, perhaps around the API with Firefox or timing? They all worked fine two weeks ago before the update with Ghostery enabled.