Thank you for the update. It is much appreciated.
This issue seems to be resoved with Firefox 8.
I«ve just tested the Firefox 8 (Final) with Windows 7 (32 Bit) and the Host Checker starteds as it did with Firefox 6.x.
Indeed the issue with Firefox 7.0.1, Host Checker and Windows 7 appears to be resolved by an upgrade to Firefox 8.0 released today.
The problem with Firefox 7.0.1 will also be resolved in upcoming IVE OS Release 7.1R5.