Examine source code of Jira Ticket Timer

{
  "manifest_version": 3,
  "name": "Jira Ticket Timer",
  "short_name": "Jira Ticket ",
  "version": "1.0.0",
  "description": "Adds a time tracking timer directly to Jira tickets with automatic time logging to the issue",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "https://*.atlassian.net/browse/*",
    "https://*.atlassian.net/jira/*"
  ],
  "background": {
    "scripts": [
      "background/service-worker.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Jira Ticket Timer",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.atlassian.net/browse/*",
        "https://*.atlassian.net/jira/*"
      ],
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "options_page": "options/options.html",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jira_ticket_timer@forgex.aevorn",
      "strict_min_version": "109.0"
    }
  }
}