Examine source code of Do You Even Alt Text?

{
  "description": "Bro, do you even alt text? Shows which images on Twitter are missing relevant alt text.",
  "manifest_version": 2,
  "name": "DYEAT?",
  "version": "1.2resigned1",
  "homepage_url": "http://about.ckundo.com",
  "applications": {
    "gecko": {
      "id": "dyeat@ckundo.com",
      "strict_min_version": "45.0"
    }
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "dyeat.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "images/dyeat.jpg"
  ]
}