Automatically enter fullscreen on Disney+ videos when clicking the Play/Continue button and it stays on! So you can binge watch all you want. Created using the following website: https://workik.com/ai-powered-javascript-code-debugger with refining done by zzzcode.ai's Code Generator and ChatGPT.
What exactly this script does is automatically go into your browser's DRM fullscreen mode as if you clicked the fullscreen button in the player or pressed the F key. I say "as if" because it tricks Disney+'s player into thinking you aren't in fullscreen therefore it doesn't try to kick you out of fullscreen mode upon an episode ending. You'll notice the script working if the fullscreen icon still says fullscreen. I should note though IF you pause and EXIT fullscreen via the esc key and go back into FS mode via actually clicking the FS button or hitting the F key Disney+ WILL boot you out of fullscreen when the episode ends since at that point you aren't tricking it any longer. So if you do have to exit FS mode for whatever reason, I suggest just hovering your mouse over the episode you are watching and click on Back which is in the upper left hand corner of the screen then proceed to click on the CONTINUE button to reinitiate the script when you're ready for more! :D
Note: I've only tested this on Firefox! It should work on them all though
Warning: Currently NOT compatible with Netflix Marathon (Pausable) by @aminomancer. I'd love help making it work with said script. It IS however compatible with Dreamliner's Streaming enhanced Firefox Add-on/Extension which I use for skipping everything (Intros/Credits/Recaps) but Ads. For Ads I use uBlock Origin since it cuts them out rather than speeding them up like Dreamliner's add-on does. I suggest using Violentmonkey but it can work with Tampermonkey.