Exactly, it's had support for years, and I've used it. I've seen it used a fair bit, and it's only not more widely used because Chromium devs refuse to add it.

The plugin works, but is inefficient (due to the nature of the plugin system), and will lag horrendously if there's more than one or two small APNGs on the page.

There still aren't bookmarks? I was one of the many complaining about this when Opera Next first came out and several people told me that it was coming soon. If it's been this long and they still haven't added even that back in, I'm severely doubting I'll ever be switching to it.

Chromium devs have always refused to implement APNG support as it is not official, but Opera 12 (and Firefox) both support it, and it has a fair bit of use around the web. I'd like to see support for this added into Opera Next at some point.