Unlock origin. Go to settings. Look for "Default Behaviour". Under it, you'll find an option to block media larger than any size you choose. I put 100KB for mi

Unlock origin. Go to settings. Look for "Default Behaviour". Under it, you'll find an option to block media larger than any size you choose. I put 100KB for mine. Also, you can install the Firefox extension called Video Image Block. It's a real data saver. Lastly, look up bandwidth hero. Can help compress images on a server before it gets to you. I'm using free heroku tier for mine.