Examine source code of Eztrackr

{
  "manifest_version": 2,
  "name": "Eztrackr",
  "description": "Ease your job hunt by adding your jobs in an organized Trello board",
  "version": "2.0.2",
  "background": {
    "page": "popup.html",
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon_48.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "web_accessible_resources": [
    "settings/index.html"
  ],
  "options_page": "settings/index.html",
  "options_ui": {
    "browser_style": true,
    "chrome_style": true,
    "page": "popup.js"
  }
}