Examine source code of Your Daily Affirmations

{
  "manifest_version": 2,
  "name": "Your Daily Affirmations",
  "version": "1.0",
  "description": "Your Daily Affirmations gives you positive affirmations every time you open your browser.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "images/you-logo.png"
    }
  },
  "icons": {
    "128": "images/you-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c15e8548-38b9-4fd1-b03e-11037f7954c6}"
    }
  }
}