Hi!
I am a Firefox AddOn developer on my own, so I activated showing errors from AddOns in error console. That's why I noticed a real error console spam from your Firefox AddOn, so I am not able to find the errors of my own AddOn anymore. ;)
This is, what the error console says (more than 100 times for each website call):
Error: Could not convert JavaScript argument arg 0 [nsISupports.QueryInterface] = NS_ERROR_XPC_BAD_CONVERT_JS Source: file:///C:/Program%20Files%20(x86)/Norton%20Internet%20Security/Engine/18.6.0.29/rfhelper32.js line: 348
Please fix this issue, it is quite annoying for every Firefox AddOn developer.
Thanks in advance!
EDIT: for your information: I am running Firefox 6.0.1 on Windows 7