At the time of posting this review the latest update breaks YouTube and Google elements such as signing in and viewing YouTube videos I'm left with a black screen video and only get sound and can't sign in the email entry box is gone/
Can you confirm if its on your end. I just did a test on a profile on portable Firefox developer(49.oa2) that i keep updated every other week in line with my main browser and everything is fine working there and this is the the culprit i reverted back to lower version "no resource uri leak(0.1.0)" and it works fine.
Please enable debugging in the add-on preferences and then post everything in Developer > Browser Console when you see problems.
Where to post things: