Hello. I'm following Adblock Plus on Twitter, and I happened to make a comment about an Oreo Cookie that keeps popping up briefly on my Twitter feed.
(It pops up frequently [usually while I'm scrolling up or down], but only for a second or two at most, and then it always vanishes before I even have a chance to click on it.)
Anyway, I just received a Tweet from someone at your end advising me to submit a screenshot (and seconds later the offending Oreo made one of its brief 'hide & seek' appearances).
I wasn't too sure where exactly to send the screenshot, so I decided to register and post it here (I hope that's okay - I'm using 'Firefox Quantum' version 66.0.3, 64-bit)