Examine source code of Tranquility for eReader

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "3.0.17",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://tranquility.ushnisha.com/",
  "applications": {
    "gecko": {
      "id": "yuhewang.ustc@gmail.com",
      "strict_min_version": "63.0"
    }
  },
  "icons": {
    "16": "icons/tranquility-16.png",
    "24": "icons/tranquility-24.png",
    "32": "icons/tranquility-32.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "storage",
    "alarms",
    "contextMenus"
  ],
  "browser_action": {
    "default_icon": "icons/tranquility-32.png",
    "default_title": "__MSG_extensionBrowserActionTitle__"
  },
  "web_accessible_resources": [
    "css/tranquility.css",
    "icons/*.png"
  ],
  "options_ui": {
    "page": "options/tranquility_options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "background/tranquility_bg_db_interface.js",
      "background/tranquility_bg_message_manager.js",
      "background/tranquility_presets.js",
      "background/tranquility_bg_common_functions.js",
      "background/tranquility_bg_context_menu.js"
    ]
  },
  "commands": {
    "run-tranquility": {
      "suggested_key": {
        "default": "Ctrl+Alt+T"
      },
      "description": "__MSG_extensionCommandRunDescription__"
    },
    "show-tranquility-preferences": {
      "suggested_key": {
        "default": "Ctrl+Alt+J"
      },
      "description": "__MSG_extensionCommandShowPreferencesDescription__"
    },
    "show-tranquility-offline-pages": {
      "suggested_key": {
        "default": "Ctrl+Alt+K"
      },
      "description": "__MSG_extensionCommandShowOfflinePagesDescription__"
    }
  },
  "default_locale": "en"
}