You will need to install a user script manager extension to install this script.
A simple script that adds a download button for videos hosted on Reddit. (new Reddit only)
This is ONLY for videos hosted on reddit, since embeded sources can be easily downloaded without this script anyway.
The button basically just opens a Viddit/Ripsave page for the specific video in a new tab.
You can download the video from there in one click.
Unlike some other services I tried, Ripsave includes audio with the videos.
I'm not associated with Ripsave in any way, this just makes the whole process easier.
(Update: 07/12/2020) As of writing this, Ripsave (the site) is working again, but they have changed, so this script doesn't work with it currently. I will fix it later. Use Viddit instead for now.
Should now work everywhere on reddit.
Reddit likes to change things up occasionally, so let me know if this stops working and I'll fix it (again) as soon as I can.