Examine source code of Jira Ninja

{
  "manifest_version": 3,
  "name": "Jira Ninja",
  "version": "1.9",
  "description": "Adds a ninja-button next to the jira-issue ID that copies the ID to the clipboard.",
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.atlassian.net/*"
      ],
      "js": [
        "js/content.js"
      ],
      "css": [
        "css/styles.css"
      ]
    }
  ],
  "action": {
    "default_popup": "settings.html",
    "default_icon": {
      "16": "images/icon.png",
      "32": "images/icon.png"
    }
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": false
  },
  "icons": {
    "16": "images/icon.png",
    "32": "images/icon.png",
    "48": "images/icon.png",
    "128": "images/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jiraninjaextension@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}