Firefox blocked one specific job page and said it contained malware. A Sucuri scan shows that the site carries advertisements from third-party sources, so this was the most likely reason for the page to be blocked. The page is now viewable without any warning, and Sucuri shows it as clean.
Malvertising : could happen to anyone. What counts is how fast they move to clean everything up once they receive a report that it's happening (and I've sent in a report to support@technojobs).
Follow-up : the support team moved fast to fix this. Excellent.
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IT Jobs advertised online. Thousands of new IT Jobs, Telecoms jobs and technical jobs. Technojobs is the leading UK IT Jobs and technical recruitment website, online since 1999.