Could it be something else since 5 different browsers dont show an edit button ?
Yes, its unlikely to be the issue with the code itself, especially if you have used Chrome, it sounds like something blocking it somewhere, maybe some AV or adblock software or something.
It's working in all the browsers I've tested. The cache updating I just added should hopefully make everyone get the latest script versions that I know should work.
The only issue I can reproduce is the ad positioning on iOS devices.