Examine source code of Jsmon

{
  "manifest_version": 2,
  "name": "Jsmon",
  "version": "1.1",
  "description": "Fetches and scans JS urls from network history",
  "permissions": [
    "webRequest",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "support@jsmon.sh",
      "strict_min_version": "58.0"
    }
  }
}