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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "A11Y HTML5 Validator",
  "description": "A11Y HTML5 Validator",
  "version": "3.1.2",
  "icons": {
    "128": "icon_128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "web_accessible_resources": [
    "app/*.css",
    "app/*.custom.css",
    "app/modal.html",
    "images/logo.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "app/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Validate A11Y HTML5 Validator",
    "default_popup": "app/modal.html"
  },
  "manifest_version": 2
}