A: You can get your own YouTube API key and use that instead of the app's default key. Follow the instructions here https://www.slickremix.com/docs/get-api-key-for-youtube/ up until Step 8 and then paste that key into the box in the extension popup below "Custom API Key" and then click on "Save Key".
A: Maybe you entered your API key wrong? Just re-enter it. The other possibility is that there's an issue with the Youtube API or my flawless code in which case you'll either have to wait for Google or I to fix it.
A: The quota resets at 12AM PST each day so you could wait till then, if you've done that and it's still broken then see the above answer.
Q: I typed some gibberish into the API Key box instead of an actual API Key and now nothing works and I can't be bothered to get a valid API key either.
A: Well that wasn't very smart was it? Hopefully you have learnt a valuable life lesson about following instructions. Anyway to fix it just press the "Save Key" button while the text box is empty and it will go back to using the default key.
A: The quota is Google's, not mine, trust me I wish you could pay me to bypass it too.
Could you maybe port the addon to Firefox or release the source code (of course putting the API key into a separate file and putting that into the .gitignore) so we could port it ourselves? This addon is really cool!