There's a bug report on bugzilla (#323860) that ESC fails to stop MNG animations. I just tried with seamonkey on FreeBSD with the latest 1.9a1 patch from mngzilla, and ESC does indeed stop simple ms.png and ie.png animations at
ftp://ftp.simplesystems.org/pub/libpng/mng/images
The bug report was about the animations at http://www.libmng.com/MNGsuite/text_scroll_img.html
which happen to be very long. Those seemed to stop for me as well but it's hard to tell because
I was on a very sluggish system.
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Using the latest mahowi build of Firefox on a more responsive Windows XP platform, the scrolling MNGs and the other smaller MNGs from simplesystems that I mentioned previously are stopped immediately by using the ESC key.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
There's a bug report on bugzilla (#323860) that ESC fails to stop MNG animations. I just tried with seamonkey on FreeBSD with the latest 1.9a1 patch from mngzilla, and ESC does indeed stop simple ms.png and ie.png animations at
ftp://ftp.simplesystems.org/pub/libpng/mng/images
The bug report was about the animations at
http://www.libmng.com/MNGsuite/text_scroll_img.html
which happen to be very long. Those seemed to stop for me as well but it's hard to tell because
I was on a very sluggish system.
Using the latest mahowi build of Firefox on a more responsive Windows XP platform, the scrolling MNGs and the other smaller MNGs from simplesystems that I mentioned previously are stopped immediately by using the ESC key.
ESC seems to not interrupt MNG animations if about:config shows image.animation.mode == "once".