Examine source code of Steamify

{
  "manifest_version": 2,
  "name": "Steamify",
  "description": "Will open steam related links inside the Steam client",
  "version": "1.1resigned1",
  "icons": {
    "16": "/icons/icon-16.png",
    "32": "/icons/icon-32.png",
    "48": "/icons/icon-48.png",
    "64": "/icons/icon-64.png",
    "128": "/icons/icon-128.png"
  },
  "permissions": [
    "*://*/*",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{65cdd0ff-aa27-4aae-87be-772662370a58}"
    }
  }
}