Examine source code of Popup Dictionary

{
  "manifest_version": 2,
  "name": "Popup Dictionary",
  "version": "1.0",
  "description": "Adds dictionary functionality to Firefox in the style of the Google Dictionary extension for Google Chrome",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "icons/icon19.png",
      "38": "icons/icon38.png"
    },
    "default_title": "Popup Dictionary"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dictionary.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "styling/popup.html"
  ],
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "options_ui": {
    "page": "styling/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{79dcc4ab-9400-410e-8d8f-62a8f6758002}"
    }
  }
}