Examine source code of Explosive Material Symbol

{
  "manifest_version": 2,
  "name": "Explosive Material Symbol",
  "version": "1.0",
  "description": "The explosive symbol is a safety warning symbol to indicate materials that are potentially explosive and dangerous to humans and the environment.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{07866976-f91d-46ef-acd6-3eac48d4e2f0}"
    }
  }
}