Examine source code of Love Not Robots

{
  "name": "Love Not Robots",
  "description": "Replaces the \"I'm not a robot\" text from Google's reCAPTCHA with the words \"I feel love for others\".",
  "version": "1.2",
  "homepage_url": "http://www.jeffreythompson.org",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "jquery-3.2.1.min.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "replace.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "manifest_version": 2
}