Trouble with APNG for Opera and Chrome

I just installed these extensions/plugins, APNG for Opera and APNG for Chrome, but I can't get them to work. I've enabled them on the domain where I want to be able to view animated PNGs, but all I can see is the first still frame every time. Does anyone know anything about this plugin and how I can get it to work?

 

While I'm familiar with PNG and MNG, this is the first I've heard of APNG.
Can you post the web address of the site where you want to view the APNGs?

 

Here's the Wikipedia page on APNGs. You should be able to see the example as an animation if you're viewing in Firefox, but if you're viewing the page in Opera or Chrome, it'll just appear as a still image.

https://en.wikipedia.org/wiki/APNG

 

Thanks.
I see the animation in Firefox, but I don't use Chrome or Opera. Sorry.

 

Got it figured out now. Apparently, it's not good to try playing an APNG in Opera or Chrome if you have another animation (or video too, I think) playing in the same or another window. Even with the plugin, neither browser is very good yet at supporting APNGs. Firefox works fine though.