Examine source code of TestRail YTtestCase

{
  "description": "Copy Test Case id for YouTrack",
  "manifest_version": 2,
  "name": "TestRail YTtestCase",
  "version": "1.0.1.0",
  "homepage_url": "https://github.com/cernyjan/TestRail-YTtestCase",
  "icons": {
    "48": "icons/folder-48.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/folder-48.png",
      "32": "icons/folder-48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "TestRail-YTtestCase.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/folder-48.png"
  ]
}