Examine source code of Text Style Editor

{
  "manifest_version": 2,
  "name": "Text Style Editor",
  "version": "1.0",
  "description": "Edit the style of selected text on any webpage.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Text Style Editor"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{67d00f14-4ebe-4a9d-be95-2694849c96b9}"
    }
  }
}