Examine source code of Jira to Git Branch

{
  "manifest_version": 2,
  "name": "Jira to Git Branch",
  "author": "Mohibul Hassan Chowdhury",
  "version": "1.0",
  "description": "Creates git branch name from Jira ticket and copies to clipboard",
  "browser_specific_settings": {
    "gecko": {
      "id": "jira-git-branch@mohib.dev",
      "strict_min_version": "58.0"
    }
  },
  "developer": {
    "name": "Mohibul Hassan Chowdhury",
    "url": "https://mohibulsblog.netlify.app"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_title": "Copy Git Branch Name",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+C"
      },
      "description": "Copy Git Branch Name"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.atlassian.net/browse/*",
        "*://*.jira.com/browse/*",
        "*://*/browse/*",
        "*://*/jira/browse/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}