Examine source code of metheus-app

{
  "manifest_version": 2,
  "name": "Metheus: Learn languages with subtitles",
  "description": "__MSG_extensionDescription__",
  "version": "1.0.1",
  "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",
    "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",
    "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",
    "smart-hub-pill-ui.html",
    "page-favicons/*"
  ],
  "commands": {
    "copy-subtitle": {
      "description": "__MSG_shortcutMineSubtitleDescription__"
    },
    "metheus-toggle-popup": {
      "description": "Toggle Metheus popup"
    },
    "copy-subtitle-with-dialog": {
      "suggested_key": {
        "default": "Ctrl+Shift+X",
        "mac": "MacCtrl+Shift+X"
      },
      "description": "__MSG_shortcutMineSubtitleAndOpenDialogDescription__"
    },
    "toggle-video-select": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "__MSG_shortcutSelectSubtitleTrackDescription__"
    },
    "export-card": {
      "description": "__MSG_shortcutExportCardDescription__"
    },
    "take-screenshot": {
      "suggested_key": {
        "default": "Ctrl+Shift+V",
        "mac": "MacCtrl+Shift+V"
      },
      "description": "__MSG_shortcutTakeScreenshotDescription__"
    },
    "toggle-recording": {
      "description": "__MSG_shortcutToggleRecordingDescription__"
    }
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "Metheus"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "metheusextension-firefox@metheus.app",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteActivity",
          "websiteContent"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "clipboardWrite",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": false,
      "exclude_globs": [
        "*://metheus.app/*",
        "*://www.metheus.app/*",
        "http://127.0.0.1/*",
        "http://127.0.0.1:*/*",
        "http://localhost/*",
        "http://localhost:*/*",
        "https://127.0.0.1/*",
        "https://127.0.0.1:*/*",
        "https://localhost/*",
        "https://localhost:*/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/dictionary-hover.js"
      ]
    },
    {
      "matches": [
        "http://127.0.0.1/*",
        "http://localhost/*",
        "http://metheus.app/*",
        "http://www.metheus.app/*",
        "https://127.0.0.1/*",
        "https://localhost/*",
        "https://metheus.app/*",
        "https://www.metheus.app/*"
      ],
      "js": [
        "content-scripts/metheus-bridge.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": false,
      "exclude_globs": [
        "*://*.metheus.app/*",
        "*://metheus.app/*",
        "http://127.0.0.1:*/*",
        "http://localhost:*/*",
        "https://127.0.0.1:*/*",
        "https://localhost:*/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/page-colorizer.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "exclude_globs": [
        "*://metheus.app/*",
        "*://www.metheus.app/*",
        "http://127.0.0.1/*",
        "http://127.0.0.1:*/*",
        "http://localhost/*",
        "http://localhost:*/*",
        "https://127.0.0.1/*",
        "https://127.0.0.1:*/*",
        "https://localhost/*",
        "https://localhost:*/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/page.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "exclude_globs": [
        "*://metheus.app/*",
        "*://www.metheus.app/*",
        "http://127.0.0.1/*",
        "http://127.0.0.1:*/*",
        "http://localhost/*",
        "http://localhost:*/*",
        "https://127.0.0.1/*",
        "https://127.0.0.1:*/*",
        "https://localhost/*",
        "https://localhost:*/*"
      ],
      "run_at": "document_idle",
      "css": [
        "content-scripts/video.css"
      ],
      "js": [
        "content-scripts/video.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Metheus"
  }
}