Examine source code of Critical thinking symbol

{
  "manifest_version": 2,
  "name": "Critical thinking symbol",
  "version": "1.0",
  "description": "Critical thinking is the ability to ask questions, objectively analyze and evaluate information logically before making decisions.",
  "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": "{a2264127-fb1a-4e19-8ac9-58d9eef951a3}"
    }
  }
}