image.animation_mode = once is now broken.
I hate chrome's lack of animation control and now firefox is behaving the same.
I really hope this is just a bug (I can't find anything about it on google) and will be fixed soon
(unlike the open bug for .ico animation which has been in NEW state for years).
^That was finished last month :)
https://www.mikestoolbox.org/ says it is TLS 1.2 (after I enabled it), but there is no GCM (main advantage of TLS 1.2).