Rated 4 out of 5 stars
Yet another nice security tool :-)
Just thought I'd mention...
addons.mozilla.org accepts the faked firefox version and will filter search results accordingly. I'd expect it to gray out what it thinks are add-ons only compatible with higher versions of firefox, so users might have issues installing some add-ons.
Or, maybe not.
Either way, nice innovation in the security/privacy department :-)