gfycat bookmarklet
When a big gif animation starts loading (as the only resource in the page), hit this bookmarklet and the gfycat.com proxy will serve you a proper video.
Bookmarklet: gfycat
This is a modification of the code in this reddit comment by joey5755, but mine opens a playing gif in the same window (to hopefully stop the gif download), while joey5755's opens in a new tab.
comments failed- HTTPConnectionPool(host='bang', port=9031): Max retries exceeded with url: /public/comments (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f29e3921320>: Failed to establish a new connection: [Errno 111] Connection refused',))
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