Examine source code of Loupe

{
  "manifest_version": 2,
  "name": "Loupe",
  "version": "1.1",
  "homepage_url": "https://github.com/scullionw/loupe/",
  "description": "Highlights occurrences of selected word in page.",
  "icons": {
    "96": "icons/loupe-96.png",
    "128": "icons/loupe-128.png",
    "256": "icons/loupe-256.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Loupe",
    "default_icon": {
      "96": "icons/loupe-96.png",
      "128": "icons/loupe-128.png",
      "256": "icons/loupe-256.png"
    }
  },
  "background": {
    "page": "background/background.html"
  },
  "permissions": [
    "find",
    "storage"
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "loupe.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "@loupe-extension"
    }
  }
}