Why does "Download this video" keep popping up when there isn't even a video on the page?
I just closed 3 tabs in a row and "Download this video" was on the screen even on the fourth tab until I moved the pointer down onto the page to close it manually, it went out before I got there. Sometimes I have to chase it until I can hit the "x", then it stays off for a while.
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Sounds that you have an extension that isn't working properly.
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
See:
Default is the only thing there even in Safe Mode, no other 'Themes'. This [even displaying the "Download this video" box] never happened before installing 4.x.