Examine source code of Script Injector

{
  "manifest_version": 2,
  "name": "ScriptInjector",
  "short_name": "ScriptInjector",
  "version": "3.1.1",
  "description": "Script Injector - custom scripts injection on each website.",
  "browser_action": {
    "browser_style": true,
    "default_popup": "Distribution/Popup/index.html",
    "default_icon": {
      "64": "Images/logo-64.png"
    }
  },
  "background": {
    "scripts": [
      "Distribution/Background/background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "Distribution/Content/content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "<all_urls>",
    "storage",
    "tabs",
    "contextMenus",
    "webRequest"
  ],
  "web_accessible_resources": [
    "Distribution/Background/*.{js}",
    "Distribution/Content/*.{js}",
    "Distribution/Popup/*.{html,js,jpg,ttf,png}",
    "Distribution/Dashboard/*.{html,js,jpg,ttf,png}",
    "Images/*.{jpg,jpeg,gif,ico,png}"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';"
}