I have no idea even how to describe this, but it has been happening for a very long time and I am so fed up with it at this point. It makes no difference what kind of video, or website, or any other factor, it always happens when I click to go full screen for the video. As soon as the screen goes full, where ever my mouse pointer is sitting, a small tool tip window opens up that shows the page url, or other kind of gibberish that I have no idea how to describe. It will stay on the screen no matter what, until I click to exit full screen mode of the video. I have replicated this with Youtube, Netflix, Hulu, or any other social media page with video links, or any other website with an imbedded video that I can make full screen. I have tried it in Incognito mode and standard mode and it is always the same. Click full screen, tool tip appears. Every. Time. The only way I can get it to not appear is to immediately swipe my mouse pointer to the bottom right corer of the screen immediately after clicking the full screen button. If I am fast enough it will either not show, or I get it to show on the edge of the screen where it can't be seen, but I'm not sure. This has been extremely frustrating having to constantly switching from full screen to non-full screen repeatedly to time it just right to not have this appear and stay on my screen. Please tell me there is a way to stop this from happening. It has been many, many months this has been going on. I probably couldn't even remember the last time I didn't have to deal with this. I've kept my browser up to date, I've turned off all extensions, used the Troubleshooting mode, everything except uninstalling and reinstalling the whole browser. I'd much rather not have to deal with that and hope you can help. I have been a loyal user of Firefox browser for nearly 17 years (probably more) and I will not use any other site. Please help me to stop going crazy every time I want to watch anything in full screen.