Examine source code of Mouse Dictionary

{
  "manifest_version": 2,
  "name": "Mouse Dictionary",
  "version": "1.5.13",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "author": "wtetsu",
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon19.png",
    "default_title": "Mouse Dictionary"
  },
  "commands": {
    "_execute_browser_action": {
      "description": "Activate the extension"
    },
    "scroll_down": {
      "description": "Scroll down"
    },
    "scroll_up": {
      "description": "Scroll up"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "data/*.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{596d6a6e-ba7e-4cf5-8f88-cec08a06ef2a}"
    }
  }
}