Here is another plug-and-go solution to running your VFP app inside a web browser. Apparently virtually no code changes other than plugging in some DLL support. It intercepts calls to GDI/GDIPlus and converts to HTML5 for access in a compatible browser.

ThinfinityTM Virtual UI - Beta

Instantly upgrade and extend the lifespan of legacy Windows Apps

Remoting Windows Applications is one of the keys to expand the application’s availability to end-users, to prolong its lifespan, and to boost business efficiency. Thinfinity™ Virtual UI enables you to deliver in-house developed Windows applications as a cross-browser, cross-device web apps, while eluding the use of costly virtualization or remoting environments such as Citrix XenApp® or Microsoft™ RemoteApp, hence slashing IT costs and simplifying maintenance and administration.


http://www.cybelesoft.com/Thinfinity/VirtualUI/