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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Peek",
  "version": "1.0",
  "description": "Allows you to peek at links before you enter them",
  "permissions": [
    "tabs",
    "*://*.google.com/*"
  ],
  "options_page": "options.html",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "page_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 2
}