I like the concept, but too many sites were broken too badly and too randomly to keep using this extension. I had many sites just hang until I killed the extension when prompted by Firefox, then two different sites break with PayPal checkout and it was in such a non-obvious fashion that I finally had to just uninstall it for now.

I like the previous (0.2.1) version more. GUI looks disgusting after update and I can feel worse performance.