Examine source code of Webskan test

{
  "name": "Webskan test",
  "version": "0.0.4resigned1",
  "manifest_version": 2,
  "description": "Test proxy response to Request.",
  "homepage_url": "https://webskan.com",
  "browser_action": {
    "default_icon": "icon19.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "activeTab",
    "<all_urls>",
    "webNavigation"
  ],
  "applications": {
    "gecko": {
      "id": "webskan.dev@gmail.com",
      "strict_min_version": "47.0"
    }
  }
}