Examine source code of PDF Annotator Fun

{
  "manifest_version": 2,
  "name": "PDF Annotator Basic",
  "version": "1.0",
  "description": "Annotate and highlight PDF documents. is a cool utility and feature to annotate and save pdf quickly.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "images/pdf-logo.png"
    }
  },
  "icons": {
    "128": "images/pdf-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b71869c4-60d1-488e-8a60-bb4a9a7564fd}"
    }
  }
}