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Extensions 
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Mobile simulator - responsive testing tool
Smartphone and tablet simulator on computer with several models to test mobile responsive websites.
Viewport Resizer – Responsive Testing Tool
Responsive design testing tool to test any website’s responsiveness – it only takes 2 seconds! Emulate various screen resolutions.
vREST - REST API Testing Tool
vREST is an automated REST API Testing Tool. This extension records HTTP requests and their responses in vREST application.
VIEWTEST - Amazon Image Testing Tool
The testing tool will allow the user to enter their own product main picture and to see it as if it was selling on amazon.
McGaw.io AB Testing Tracking Tool
This extension allows you to calculate the statistical significance & conversion rate of your A/B tests.
FirstData.lv Testing Tool
Fills FirstData.lv payment form with sample credit card data for testing purposes