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design.js

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+// This file is part of YouTube Only Music.
+//
+// YouTube Only Music is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+//
+// YouTube Only Music is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with YouTube Only Music. If not, see <https://www.gnu.org/licenses/>.
+// Copyright 2022 Kaneko Qt
+
+document.styleSheets[0].insertRule(`#main-panel { display: none !important; }`);
+document.styleSheets[0].insertRule(`.side-panel.ytmusic-player-page { max-width: unset !important; width: 100% !important; margin: unset !important; }`);
+document.styleSheets[0].insertRule(`.content.style-scope.ytmusic-player-page { padding: unset !important; }`);

logic.js

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+// This file is part of YouTube Only Music.
+//
+// YouTube Only Music is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+//
+// YouTube Only Music is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with YouTube Only Music. If not, see <https://www.gnu.org/licenses/>.
+// Copyright 2022 Kaneko Qt
+
+var inject = function () {
+  const proxied = XMLHttpRequest.prototype.open;
+  XMLHttpRequest.prototype.open = function (method, url) {
+    if (url.indexOf("mime=audio") !== -1) {
+      var video = document.querySelector("video");
+      video.onloadeddata = function () {
+        var sections = url.split('?');
+        if (sections.length > 1) {
+          var keys = ['rn', 'rbuf', 'range'];
+          var parameters = sections[1].split(/[&;]/g);
+          keys.forEach(k => { parameters = parameters.filter((p) => !p.startsWith(encodeURIComponent(k) + '=')) });
+          url = sections[0] + '?' + parameters.join('&');
+          if (video.src !== url) {
+            video.pause();
+            video.src = url;
+            video.currentTime = 0;
+            video.play();
+          }
+        }
+      };
+    }
+    return proxied.apply(this, arguments);
+  };
+};
+/*  */
+var script = document.createElement("script");
+script.textContent = "(" + inject + ")()";
+document.documentElement.appendChild(script);

manifest.json

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+{
+  "manifest_version": 2,
+  "name": "YouTube Only Music",
+  "version": "1.0.0",
+
+  "description": "Load only audio on YouTube Music.",
+
+  "content_scripts": [
+    {
+      "matches": ["*://music.youtube.com/*"],
+      "js": ["./logic.js"],
+      "run_at": "document_start"
+    },
+    {
+      "matches": ["*://music.youtube.com/*"],
+      "js": ["./design.js"],
+      "run_at": "document_end"
+    }
+  ]
+}