Examine source code of Jira Extension

{
  "manifest_version": 2,
  "name": "Jira Extension",
  "version": "1.0",
  "description": "This adds diagrams to the ETC-Jira-Dashboard",
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.support.etc-consult.de/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{103e3bef-e565-4533-8648-ab4b0fca4c1e}"
    }
  }
}