On higher security levels videos can't be downloaded anymore with "Save Video As..."
Following https://blog.torproject.org/blog/tor-browser-701-released#comment-269143:
1. Go to: https://gemmei.ftp.acc.umu.se/pub/debian-meetings/2016/miniconf_cambridge16/reproducible_builds_status_update.webm, NoScript will display the video as a blocked object.
2. Click on the object and allow the video to play.
3. Right click "Save Video As...", choose a location, and accept.
4. Open "about:downloads" to verify the video isn't downloading.
5. Now, right click anywhere and under the NoScript menu click "Revoke Temporary Permissions".
6. Repeat step 1, you will presented with the blocked object. Right click on that object and choose "Save Link As...", accept.
7. Open "about:downloads" and verity the video is now downloading.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information