Examine source code of Pseudolocalize

{
  "description": "A tool for testing localization. Insert accented characters and make words 30% longer or swap text to read right to left.",
  "manifest_version": 2,
  "name": "Pseudolocalize",
  "version": "1.0.1resigned1",
  "homepage_url": "http://stephaniehobson.ca",
  "icons": {
    "48": "icons/p12e-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/p12e-48.png",
    "default_title": "Pseudolocalize",
    "default_popup": "popup/p12e.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c10718e-9495-4f55-8630-9b606c03707d}"
    }
  }
}