getTweet can download the video/gif directly from twitter.com with a single click.
Download any video/gif from twitter.com with some simple steps :
1) Download the extension
2) Open twitter.com
3) getTweet extension will place a download button next to the tweet containing the video/gif.
4) Click on the download button.
No need to copy and paste the link in some website, just install the extension once and keep using twitter and download any video/gif with a single click.