Enumerate all objects available to WebWorkers and content
In #13027 (moved), we learned that WebWorkers do in fact have a different, custom view of important objects like window.navigator.
For completeness, we should probably enumerate all objects visible properties of WebWorkers in Tor Browser and Firefox 31ESR, and verify that there are no surprising differences (or other objects we're concerned about).
I believe we already incorporated a test from iSEC to do this with the normal content window. We should probably augment that to examine WebWorkers, too, and then run it for differences on both.