browsercheck.qualys.comは安全ですか？

Useful tool to find vulnerable and outdated extensions/plugins installed in your web browser, as well as if the browser and OS are up to date. Outdated software may be exploited by malicious websites (many running exploit packs/kits) to silently install malware on visitor`s PC without it`s knowledge (http://en.wikipedia.org/wiki/Drive-by_download). Outdated software is also more vulnerable to malware intrusion and spreading attempts.