Examine source code of Darker YouTube

{
  "name": "Darker YouTube",
  "version": "4.0",
  "description": "YouTube Darkmode is now even darker",
  "icons": {
    "128": "assets/logo-128.png"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "./styles/youtube/backgrounds.css",
        "./styles/youtube/buttons.css",
        "./styles/youtube/chips.css",
        "./styles/youtube/colors.css",
        "./styles/youtube/country-code.css",
        "./styles/youtube/fonts.css",
        "./styles/youtube/icons.css",
        "./styles/youtube/likebuttons.css",
        "./styles/youtube/navbar.css",
        "./styles/youtube/player.css",
        "./styles/youtube/popups.css",
        "./styles/youtube/progressbar.css",
        "./styles/youtube/scrollbar.css",
        "./styles/youtube/searchbox.css",
        "./styles/youtube/subscribe.css",
        "./styles/youtube/text.css",
        "./styles/youtube/theme.css",
        "./styles/youtube/thumbnails.css",
        "./styles/youtube/togglebutton.css",
        "./styles/youtube/topbar.css",
        "./styles/youtube/yt-logo.css"
      ],
      "js": [
        "./scripts/accentColor.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://music.youtube.com/*"
      ],
      "css": [
        "./styles/music/av-switch.css",
        "./styles/music/titlebar.css",
        "./styles/music/backgrounds.css",
        "./styles/music/buttons.css",
        "./styles/music/theme.css",
        "./styles/music/progressbar.css",
        "./styles/music/badges.css",
        "./styles/music/searchbox.css",
        "./styles/music/tabs.css",
        "./styles/music/thumbnails.css",
        "./styles/music/player.css",
        "./styles/music/popups.css",
        "./styles/music/songItem.css",
        "./styles/music/icons.css",
        "./styles/music/settings.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://music.youtube.com/*"
      ],
      "js": [
        "./scripts/ytMusicTheme.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://consent.youtube.com/m?*"
      ],
      "css": [
        "./styles/consent/main.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://consent.youtube.com/d?*"
      ],
      "css": [
        "./styles/consent/main.css",
        "./styles/consent/advanced_consent.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": "./assets/logo-128.png",
    "default_popup": "./pages/popup/index.html"
  },
  "options_page": "./pages/options/index.html",
  "permissions": [
    "tabs",
    "storage",
    "*://consent.youtube.com/*",
    "*://music.youtube.com/*",
    "*://www.youtube.com/*",
    "*://youtube.com/*"
  ]
}