Examine source code of Key to Click

{
  "manifest_version": 2,
  "name": "Key to Click",
  "description": "Assign keys to click for you",
  "version": "0.1.0",
  "web_accessible_resources": [
    "popup.js"
  ],
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "vendor/browser-polyfill.min.js",
        "content_script.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "96": "icons/icon@2x.png"
    },
    "default_popup": "browserAction/index.html",
    "default_title": "Key to Click"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02678e7d-b7d7-415a-99e9-dc980621db2f}"
    }
  }
}