Examine source code of Reading List

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "sidebar_action": {
    "default_title": "__MSG_appName__",
    "default_panel": "sidebar.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "leetcat@cs.ubc.ca",
      "strict_min_version": "57.0"
    }
  },
  "version": "2.4.10"
}