If it's too early to start filing bugs on Theme Experiments, just say the word. STR: 0. Create a new profile and in 'about:config' set 'extensions.legacy.enabled' to 'true'. 1. Create or install a Theme Experiment, providing some experimental rules (one is provided). 2. Check that the Experiment's changes are visible (the Identity Box is a garish lime color). 3. Open a new window. Actual Results: The experiment's changes are not visible in the new window. Any new variables aren't applied to the new window, and any stylesheets provided with the experiment are not loaded (a stylesheet isn't required to trigger this - it was just a more visible demonstration than many of the root variables not already covered). Expected Results: The experiment's changes should be visible in all future windows.

Thanks for reporting this. This seems like something we need to fix.

Pushed by ntim.bugs@gmail.com: https://hg.mozilla.org/integration/autoland/rev/de0a6c9a38a9 Make current theme experiment initialize in new windows. r=kmag