Sorry for that.

Did you Signed In, before creating a popcorn video.

Please try one more time as a testing and let me know.

Clear cookie and cache and give a try.

I tried all of those steps that you mentioned and I have the same issue.

Could you provide the Screenshot of entire webpage.

The issue may be because of your corrupted cookie file (cookies.sqlite)

Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.

• http://kb.mozillazine.org/Cookies
• https://support.mozilla.org/kb/Deleting+cookies

You can also check if DOM Storage is enabled.

• http://kb.mozillazine.org/dom.storage.enabled