Examine source code of JSON-formatter

{
  "manifest_version": 2,
  "name": "JSON formatter",
  "version": "1.1resigned1",
  "description": "Click to stringify your JSON.",
  "icons": {
    "48": "icons/icon.png"
  },
  "applications": {
    "gecko": {
      "id": "jid1-SxyqYAyTSSSiyA@jetpack",
      "strict_min_version": "45.0"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Click to stringify your JSON."
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}