Add xmlhttprequest to URL request types.
Restart FF.
Go to Sample URL where is a video, which doesn't work (does not even show).
Remove xmlhttprequest from URL request types.
Retry sample URL... it still does not work.
Restart FF.
Retry again and it works.
Add
xmlhttprequest
toURL request types
. Restart FF. Go to Sample URL where is a video, which doesn't work (does not even show). Removexmlhttprequest
fromURL request types
. Retry sample URL... it still does not work. Restart FF. Retry again and it works.