Examine source code of TestRail Historian

{
  "description": "Better history view",
  "manifest_version": 2,
  "name": "TestRail Historian",
  "version": "2.2resigned1",
  "homepage_url": "https://github.com/cernyjan/TestRail-Historian",
  "icons": {
    "48": "icons/history-48.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/history-48.png",
      "32": "icons/history-48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "TestRail-Historian.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{88eae82d-11ff-4900-a374-ef6d4348e4bf}"
    }
  }
}