Save PNG frames from Shadertoy
https://chrome.google.com/webstore/detail/shadertoy-frame-saver/bkompdalfpocndfcbcdajnfkjklbecjn
https://addons.mozilla.org/en-GB/firefox/addon/shadertoy-frame-exporter/
First checkout this repo, then:
https://developer.chrome.com/extensions/getstarted#unpacked
https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Temporary_Installation_in_Firefox
https://github.com/KoltesDigital/shadertoy-exporter