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GBT HTML5 native player, full preload, download (GBTPP)

Replaces fluid player with browsers HTML5 native player, initialises native preload and proceeds full preload in background.

// ==UserScript==
// @name         GBT HTML5 native player, full preload, download (GBTPP)
// @version      4.61
// @namespace    _pc
// @description  Replaces fluid player with browsers HTML5 native player, initialises native preload and proceeds full preload in background.
// @author       verydelight
// @license      MIT
// @icon         https://www.gayporntube.com/favicon.ico
// @connect      gayboystube.com
// @connect      gayporntube.com
// @compatible   Firefox Tampermonkey
// @grant        GM.xmlHttpRequest
// @grant        GM_download
// @grant        GM_xmlHttpRequest
// @grant        GM.download
// @match        *://*.gayboystube.com/video/*
// @match        *://*.gayporntube.com/video/*
// @webRequest   {"selector":"*fluidplayer*","action":"cancel"}
// ==/UserScript==
(async function() {
	const videoplayer = document.getElementById('play-video');
	const videoplayerSource = videoplayer.querySelector('source');
	const pattern = /\/\?br=\d*$/;
	if (videoplayerSource) {
		const src = videoplayerSource.src.replace(pattern, '');
		if (src !== videoplayerSource.src) {
			videoplayerSource.src = src;
		}
		videoplayer.removeAttribute("height");
		videoplayer.removeAttribute("width");
        videoplayer.setAttribute("preload","auto");
        videoplayer.focus();
		await downloadVideo(videoplayerSource.src);
	}
	async function downloadVideo(url) {
		try {
			const response = await GM.xmlHttpRequest({
				method: 'GET',
				responseType: 'blob',
				url: url,
				headers: {
					"Content-Type": "video/mp4",
					"Accept": "video/mp4"
				},
			});
			const blob = new Blob([response.response], { type: 'video/mp4' });
			const objectUrl = URL.createObjectURL(blob);
			const { currentTime, paused, ended } = videoplayer;
            videoplayerSource.src = objectUrl;
			videoplayer.load();
            videoplayer.currentTime = currentTime;
			if (!paused && !ended && currentTime > 0) {
				videoplayer.play();
			}
            //const parts = url.split("/");
            //const filename = parts[parts.length - 1];
            const dlinfo = document.createElement('div');
            dlinfo.textContent = "Video ready/fully preloaded - Click download button or use save as or save video as from context menue";
            dlinfo.classList.add("blue");
            dlinfo.style.fontWeight = "bold";
            const container = document.querySelector("#tab_video_info");
            const dlBttn = container.querySelector(".bttn");
            const href = dlBttn.getAttribute('href');
            const urlObj = new URL(href);
            const filename = urlObj.searchParams.get('download_filename');
            dlBttn.href = objectUrl;
            dlBttn.download = filename;
            videoplayer.parentNode.insertBefore(dlinfo, videoplayer.nextSibling);
		} catch (err) {
			console.error("GBTPP: Error in fetching and downloading file: ", err);
		}
	}
})();