I use the API a lot directly in my browser with json viewer so I made an extension to go with it. The extension will automatically add your client ID (set in the options or via the button on the top) to any requests made to the API. No more messing around with URL parameters. Perhaps someone else will find it useful as well.
Chrome: https://chrome.google.com/webstore/detail/twitch-client-id-injector/okebcaancimcjdklkimjgcpcamnbkhli
Firefox: https://addons.mozilla.org/en-US/firefox/addon/twitch-client-id-injector/
Syncs the client ID via your google account, if you’re signed into Chrome, as a bonus.