Examine source code of Interceptor

{
  "name": "Interceptor",
  "description": "Run web clients without backends by mocking HTTP requests",
  "version": "0.3.2resigned1",
  "manifest_version": 2,
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "lib/nise.min.js"
  ],
  "browser_action": {
    "default_title": "Interceptor",
    "default_popup": "index.html",
    "default_icon": "images/icon.png"
  },
  "permissions": [
    "webRequest",
    "tabs",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*",
    "storage",
    "webNavigation"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{024f65fd-47e3-4556-bd93-4c0a1d08cd33}"
    }
  }
}