Allows you to view and download twitter Videos/GIFs in highest quality. If you open up a tweet, there's a download button to the right of the tweet's Share button. The button is a direct link to the video URL and it opens the Video/GIF in a new tab. You can then save the video or share the direct link URL.

This extension has better performance and doesn't slow down twitter compared to other scripts that accomplish the same. Less code to parse, no hooks / prototype mods, no network requests, no MutationObserver, etc. It's also more resistant to changes on twitter's side.