Examine source code of Style Info

{
  "manifest_version" : 2 ,
  "name" : "Style Info",
  "version" : "1.0.3",
  "description" : "Detect style on element hover",
  "author": "Bozidar Atanasovski",
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "/scripts/page.js" 
      ],
      "css" : [
        "/styles/page.css" 
      ]
    }
  ],
  "background" : {
    "scripts" : [
      "/scripts/background.js" 
    ]
  },
  "browser_action" : {
    "default_icon" : {
      "48" : "/icons/icon.png"
    },
    "default_title" : "Style info"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c6ff34d-c3a0-43df-b711-109e4d588c7d}"
    }
  }
}