Examine source code of Web-Injector

{
  "name": "Injector",
  "description": "Easy inject payloads into HTML fields for security testing",
  "version": "2.0.0",
  "manifest_version": 2,
  "author": "Mystery",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus",
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "icons": {
    "48": "icons/Lightning.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c72786e-3203-470e-ae01-8754eecb7828}"
    }
  }
}