Examine source code of FactoidL

{
  "manifest_version": 2,
  "name": "FactoidL",
  "description": "Checks the accuracy of webpage content based on other web sources.",
  "version": "2.6.2",
  "icons": {
    "16": "FactoidL_Logo_Rounded_icon16_2.0_FINAL.png",
    "48": "FactoidL_Logo_Rounded_icon48_2.0_FINAL.png",
    "128": "FactoidL_Logo_Rounded_icon128_2.0_FINAL.png"
  },
  "background": {
    "scripts": [
      "compromise.min.js",
      "factoidl-common.js",
      "jquery-3.4.1.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "FactoidL_Logo_Rounded_icon48_2.0_FINAL.png",
    "default_popup": "popup.html",
    "default_title": "FactoidL"
  },
  "permissions": [
    "activeTab",
    "https://ajax.googleapis.com/",
    "https://*/",
    "*://*/*"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ea406f0-f92a-474f-a4e8-c91983d87de3}"
    }
  }
}