After some 9gag updates, all animation posts were converted and shown in Chrome as MP4 videos.
With 9gif extension, you still can retrieve URL to GIF for any animated post:
1. Play animation on 9gag
2. Right-click on it and choose "Get gif url for this post"
3. Clickable URL will show up at the top of the page
谷歌浏览器、其他Chromium内核的浏览器