JavaScript code to download FLV videos from pages on tangoandchaos.org. Written at the request of someone on Discord.

tangoandchaos-bookmarklet.js

function saveFile(fileUrl, mimeType) {
	var fileName = fileUrl.split('/').pop();
	fetch(fileUrl)
		.then(response => response.blob())
		.then(blob => {
			var link = window.document.createElement("a");
			link.href = window.URL.createObjectURL(blob, { type: mimeType });
			link.download = fileName;
			document.body.appendChild(link);
			link.click();
			document.body.removeChild(link);
		});
}

function saveVideo(videoElement) {
	var playerParams = new URLSearchParams(videoElement.getAttribute('flashvars'));
	var videoURL = new URL(playerParams.get('streamName') + '.flv', document.baseURI);
	saveFile(videoURL.href, 'video/x-flv');
}

var videoElements = document.querySelectorAll('embed, ruffle-embed');
videoElements.forEach(saveVideo);