Quick Downloader for X by fivefm

Quick Downloader for X saves the videos and GIFs in a post as MP4 files, through the normal Firefox download.

Works right away. Lookups go through the public Quick Downloader server at https://twitdl.skykeep.net, which the add-on is set up to use as soon as it is installed.

Saving a video

• Toolbar button on a post page: every clip in the post with a preview, a quality picker, Save and Save all. On any other page, paste a link to a post.
• Right-click a post link or the page of a post and choose Save video with Quick Downloader: every clip is saved at its best quality, with a notification when the download starts.
• GIFs are saved as MP4, and video inside quoted posts is picked up too.

Privacy. The add-on only talks to the server you chose, and only about the posts you ask it to save. No accounts, no tracking, no ads, nothing collected.