We currently jump through some hoops to register about:studies at run time. This is an artifact of being a system add-on. It is more complex than it needs to be, and creates problems like bug 1400897. The hoop jumping happens in toolkit/components/normandy/content/AboutPages.jsm. We can avoid a lot of the registration tasks in that document by doing this statically instead of dynamically. I believe that adding about:studies to the list in AboutRedirector.cpp [1] will be the best way to do this. [1]: https://dxr.mozilla.org/mozilla-central/rev/861067332bac96a44bbf41ef366f58a30476057b/browser/components/about/AboutRedirector.cpp#43