manifest.json

{
  "name": "test",
  "description": "test",
  "version": "1",
  "background_page": "app/background.html",
  "app": {
    "launch": {
      "local_path": "app/main.html"
    }
  },
  "icons": {
    "24": "24.png",
    "128": "128.png"
  },
  "permissions": [
    "tabs",
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [ "http://*/*", "https://*/*" ],
      "css": ["stylesheets/main.css"],
      "js": [ "app/prototype.js", "app/content_script.js"],
      "run_at": "document_end",
      "all_frames": true
    }
  ]
}