Examine source code of Block Tabs

{
  "manifest_version": 2,
  "name": "Block Tabs",
  "description": "Blocks new tabs, stops right click",
  "version": "2.1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "icons": {
    "64": "icons/48.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{167e1bf6-f906-47b5-891e-1dcea62b325d}"
    }
  }
}