Examine source code of OneTab

{
  "name": "OneTab",
  "description": "Access your browser tabs from everywhere at any time",
  "version": "1.1.0",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "src/popup/index.html",
    "default_title": "Open the popup"
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "contextMenus"
  ],
  "background": {
    "page": "src/background/index.html",
    "persistent": true
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b0e581f3-c6f2-4836-91d5-6e09f1328939}"
    }
  }
}