Examine source code of Kinjamprove

{
  "name": "Kinjamprove",
  "manifest_version": 2,
  "version": "0.0.0.33resigned1",
  "description": "View any Kinja comments sections with threaded replies & other improvements at the click of a button. Never click \"Show More\" again!",
  "icons": {
    "128": "icons/kinjamproveLogo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.kinja.com/*",
        "*://*.avclub.com/*",
        "*://*.jezebel.com/*",
        "*://*.jalopnik.com/*",
        "*://*.gizmodo.com/*",
        "*://*.deadspin.com/*",
        "*://*.kotaku.com/*",
        "*://*.lifehacker.com/*",
        "*://*.theroot.com/*",
        "*://*.splinternews.com/*"
      ],
      "css": [
        "comments.css"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "mutation-summary-minified.js",
        "CommentClass.js",
        "kinjamprove_firefox.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "*://*.kinja.com/*",
    "*://*.avclub.com/*",
    "*://*.jezebel.com/*",
    "*://*.jalopnik.com/*",
    "*://*.gizmodo.com/*",
    "*://*.deadspin.com/*",
    "*://*.kotaku.com/*",
    "*://*.lifehacker.com/*",
    "*://*.theroot.com/*",
    "*://*.splinternews.com/*"
  ],
  "web_accessible_resources": [
    "mutation-summary-minified.js",
    "CommentClass.js",
    "comments.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2af0eb55-a791-4f8d-b0bd-feec36466d67}"
    }
  }
}