Examine source code of asbplayer (Android)

{
  "manifest_version": 2,
  "name": "asbplayer: Language-learning with subtitles",
  "description": "__MSG_extensionDescription__",
  "version": "1.18.0",
  "icons": {
    "16": "icon/icon16.png",
    "48": "icon/icon48.png",
    "128": "icon/icon128.png"
  },
  "default_locale": "en",
  "web_accessible_resources": [
    "chunks/*",
    "fonts/*",
    "asbplayer-locales/*",
    "icon/image.png",
    "netflix-page.js",
    "youtube-page.js",
    "stremio-page.js",
    "tver-page.js",
    "bandai-channel-page.js",
    "amazon-prime-page.js",
    "hulu-page.js",
    "iwanttfc-page.js",
    "disney-plus-page.js",
    "apps-disney-plus-page.js",
    "viki-page.js",
    "unext-page.js",
    "emby-jellyfin-page.js",
    "osnplus-page.js",
    "bilibili-page.js",
    "nrk-tv-page.js",
    "plex-page.js",
    "areena-yle-page.js",
    "hbo-max-page.js",
    "cijapanese-page.js",
    "svt-play-page.js",
    "ur-play-page.js",
    "hulu-jp-page.js",
    "anki-ui.js",
    "mp3-encoder-worker.js",
    "pgs-parser-worker.js",
    "video-data-sync-ui.js",
    "video-select-ui.js",
    "notification-ui.js",
    "mobile-video-overlay-ui.html",
    "statistics-overlay-ui.html",
    "statistics-overlay-one-uncollected-ui.html",
    "statistics-overlay-one-uncollected-ui.js",
    "page-favicons/*",
    "content-scripts/video.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{49de9206-c73e-4829-be4d-bda770d7f4b5}"
    },
    "gecko_android": {}
  },
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking",
    "clipboardWrite",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://app.asbplayer.dev/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content-scripts/asbplayer.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "exclude_globs": [
        "*://app.asbplayer.dev/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/page.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "exclude_globs": [
        "*://app.asbplayer.dev/*"
      ],
      "run_at": "document_idle",
      "css": [
        "content-scripts/video.css"
      ],
      "js": [
        "content-scripts/video.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "asbplayer"
  }
}