I have come across Fastrpass accessibility extension for android. does this support testing on mobile browsers (RWD) and tablet browsers.
From your question, I'm not 100% clear which extension you're asking about. If you're asking about Accessibility Insights for Android, then it will run on any Android application. Unlike Accessibility Insights for Web, which operates as a browser extension and accesses the browser's DOM directly, Accessibility Insights for Android leverages Android's built-in accessibility support.
--Dave Tryon
(Accessibility Insights team)