Examine source code of AutoTruthLens

{
  "manifest_version": 2,
  "name": "AutoTruthLens",
  "version": "1.0.0",
  "description": "Auto Truthlens is a little different from our TruthLens add-on. This add-on adds truthlens button on the page. Checks trueness as soon as you visit a page by sending the article link to Truthlens service. You don't have to press a button to check trueness in the Auto Truthlens add-on unlike the Truthlens add-on.",
  "icons": {
    "48": "icons/tl-icon-48.png"
  },
  "applications": {
    "gecko": {
      "id": "autotruthlens-shankar.narayan@truthlenscorp.com"
    }
  },
  "web_accessible_resources": [
    "images/tl-icon-16.png"
  ],
  "permissions": [
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "autobutton-adder.js"
      ]
    }
  ]
}