Examine source code of Web Content Analysis Tool

{
  "manifest_version": 2,
  "name": "Web Content Analysis Tool",
  "version": "1.0",
  "description": "Analyze the text/image ratio of a webpage to assess readability.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icon.png"
    }
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{562b2b2e-727c-4111-9740-e82da16a0dd3}"
    }
  }
}