Examine source code of Mattermost Admin Tool

{
  "description": "Tool to administrate mattermost channels",
  "manifest_version": 2,
  "name": "Mattermost Admin Tool",
  "version": "1.0.5",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "theme_icons": [
      {
        "light": "icons/icon-32.png",
        "dark": "icons/icon-32.png",
        "size": 32
      }
    ],
    "default_title": "Mattermost Admin Tool",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b14a5eec-4749-4a5f-b6ce-43f9ca73d706}"
    }
  }
}