I think if you are using Mozilla , or chrome you can make an extension (already available in internet) then by sending hotkey you can take full page screenshot. For, Mozilla you have an extension called “fireshot” … After enabling your extension you can send ctrl+shift+y… To take full page screenshot
FireShot: Full Web Page Screenshots (♥♥♥♥♥) – Get this Extension for 🦊 Firefox (en-US)
Hope this helps!!!
Thanks,
Aman Sheik