Examine source code of Safe Links

{
  "description": "Automatically scans links for malware when you click on them.",
  "manifest_version": 2,
  "name": "Safe Links",
  "version": "1.2resigned1",
  "homepage_url": "https://vigorous-submarine.glitch.me/",
  "icons": {
    "16": "icons/icon-16.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{305b091f-89c9-4593-9355-d2193ed17250}"
    }
  }
}