The site “contains malware. Your computer might catch a virus if you visit this site,” Firefox warns.

Federation chairman Nguyen Lan Trung, the website’s content manager, told Tuoi Tre on Tuesday that his group hasn’t determined how or if it will recover from the hacking.

“It requires a huge amount of money and time to rebuild the website, and we have yet to make up our mind,” he said.

In the meantime, Trung said, the website’s data is safe.

“VFF will temporarily publish its news via email,” he said.

The warning message is responded by Firefox when a user attempts to visit vff.org.vn on July 11. 2012

Experts say the website remains available through Internet Explorer because the browser has poorer security protection than Chrome and Firefox.

“The website is still being hacked,” one information technician said.

This is not the first time the federation has fallen prey to hackers.

In 2006, a hacker who called himself "ladyfirst_hcv" replaced the VFF homepage with his own, featuring a photo of an eagle photo and the message that he just wanted to “get some information from the website for his hacking experience.”

Newswire VnExpress reported the hacker might be a high school student in Hai Phong who had attacked many other websites.