Have you scanned the site using malware scanners?

FredMcD said

Have you scanned the site using malware scanners?

hi no dear , please help me to find a good malware scanner

Windows: Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

Mac: http://www.clamxav.com/ free malware scanner for Mac OS X https://discussions.apple.com/docs/DOC-3291

You can also try https://www.malwarebytes.org/antimalware/mac/index.html

Do you mean that when you try to open the site in Firefox, it says that your website is a reported attack site?

That data comes from the Google SafeBrowsing database. You can review the information Google has about the site using this page:

https://www.google.com/transparencyreport/safebrowsing/diagnostic/index.html