Examine source code of Chrono

{
  "manifest_version": 2,
  "name": "Chrono",
  "version": "1.2resigned1",
  "description": "Add a simple lightweight timer with basic settings and a contextual popup.",
  "icons": {
    "48": "icons/chrono-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/chrono-32.png",
    "default_title": "Chrono",
    "default_popup": "src/popup/popup.html"
  },
  "web_accessible_resources": [
    "audio/*.mp3"
  ],
  "background": {
    "scripts": [
      "src/bg_chrono.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f2dab58-ce81-450f-98f5-5c344f04d3bf}"
    }
  }
}