1. your website is opened in IE but it shows "Reported Attack Site!" in mozilla firefox ?
Reasons as per google:
1. This site has some suspicious content.
2. your site network/domain company served content that resulted in malicious software being
downloaded and installed without user consent.
1. No virus problem this is a malware(malicious software) problem
2. If we solve this by doing below instructions
mozilla firefox -> tools -> options -> security
remove tick marks in first 3 points
then open our site without any problem.