Examine source code of JiraExtender

{
  "manifest_version": 3,
  "name": "JiraExtender",
  "description": "Extend Jira capabilities",
  "version": "0.0.0.6",
  "host_permissions": [
    "https://jira.edreamsodigeo.com/secure/RapidBoard.jspa*"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "matches": [
        "https://jira.edreamsodigeo.com/secure/RapidBoard.jspa*"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "92863ec02fcff77ceb90023efde5974827edfacd@hugo"
    }
  }
}