No Problems Here Rated 5 out of 5 stars
Version 4.0 works great for me using FF3.6 on Windows 7 x64 Ultimate. I have a total of 35 extension running so it can't be that Flagfox has conflicts with other extensions.
I'd also like to say that the features available in 4.0 are excellent. I find the ability to right-click on the flag icon and select from a list of external lookups to be very useful. The ability to create my own lookups may also prove useful.
Thanks for your work Dave.G!