Examine source code of Refreshie

{
  "manifest_version": 2,
  "name": "Refreshie",
  "description": "Reload any tab on a schedule: presets from 15 seconds to 1 hour or a custom interval, live countdown badge, hard-reload option.",
  "version": "2.1.0.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3d366a1a-3daa-428d-b9f8-6556278073ef}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "scripts/core.js",
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Refreshie",
    "default_popup": "scripts/popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  }
}