Examine source code of Expand Reddit Comments

{
  "manifest_version": 2,
  "name": "ExpandReddit",
  "version": "1.1",
  "description": "Expands collapsed comments on 'old' Reddit after clicking a button.",
  "icons": {
    "32": "icons/ExpandReddit-32.png",
    "48": "icons/ExpandReddit.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/ExpandReddit-32.png",
    "default_title": "ExpandReddit",
    "default_area": "navbar"
  },
  "background": {
    "scripts": [
      "ExpandReddit.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af72a944-0335-461e-b5bc-eac15f200bcb}"
    }
  }
}