I work on this periodically. Not sure what AI generation will do to these kind of hands on creation programs, but has been a fun project nonetheless. Nothing too crazy. Just make some low res art, have some layers and frames to animate, and export your gif to share with the world.
Hijacking the right-click button? I hate this. Try https://support.mozilla.org/en-US/questions/1130127#answer-8... for a fix.
Also it's broken in my LibreWolf with the error "Blocked https://spritepaint.com/ from extracting canvas data because no user input was detected."