Examine source code of Copy Buddy

{
  "manifest_version": 2,
  "name": "Copy Buddy",
  "version": "0.4.1resigned1",
  "description": "A place to store things that you want to copy and paste later",
  "icons": {
    "16": "copy-buddy-16.png",
    "48": "copy-buddy-48.png",
    "128": "copy-buddy-128.png"
  },
  "author": "christopher floess",
  "browser_action": {
    "default_icon": "drawing-1.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "storage",
    "https://ajax.googleapis.com/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c993081d-a245-4263-a430-88cdbe141072}"
    }
  }
}