Examine source code of textfocus SEO & Semantic

{
  "name": "textfocus SEO & Semantic",
  "short_name": "textfocus",
  "version": "1.1resigned1",
  "description": "Launch a semantic analysis of the current tab",
  "browser_action": {
    "default_icon": "dist/img/logo32.png",
    "default_title": "Launch a semantic analysis"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "dist/js/tf.js"
    ]
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{e57557c5-8cd6-45fa-9821-48fcbc79e387}"
    }
  }
}