Examine source code of Version Control Diff

{
  "manifest_version": 2,
  "name": "Version Control Diff",
  "version": "1.0",
  "description": "Compare differences between two code versions.",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{39a21a9c-1a65-4417-b74e-9b5d128f5517}"
    }
  }
}