Examine source code of RTAddAssetByName

{
  "manifest_version": 2,
  "name": "RTAddAssetByName",
  "version": "1.0.2",
  "description": "Adds a new input field to RT to add an asset by name",
  "content_scripts": [
    {
      "matches": [
        "*://*/Ticket/Display.html*"
      ],
      "js": [
        "contentscript.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{81c3b55e-a166-44de-9fbb-7aaf480fce84}"
    }
  }
}