Examine source code of TestRail LivePreview

{
  "description": "Live preview of Test Case",
  "manifest_version": 2,
  "name": "TestRail LivePreview",
  "version": "2.6resigned1",
  "homepage_url": "https://github.com/cernyjan/TestRail-LivePreview",
  "icons": {
    "48": "icons/preview-48.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/preview-48.png",
      "32": "icons/preview-48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "TestRail-LivePreview.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/preview-48.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{80f68152-12b0-4dcb-b749-b3457b1a0c13}"
    }
  }
}