Make GIF-laden articles less annoying

[thebaer]

Articles full of GIFs can be annoying. Either:

• Add an option to remove GIFs, or
• Replace GIFs with static images by default

Implementation
I like the second option better. We might be able to replace <img>s with <canvas>s -- this SO question indicates that setting an animated GIF as the background to a <canvas> will only show a static image. Maybe then clicking the canvas can replace it with an img that has the original GIF url as its src.

Feature request
Requested on Hacker News discussion and on Designer News.