"In 2012, a whistleblower reported a hidden backdoor in 360 Secure Browser."

"In January 2020, a Reddit user reported Qihoo's presence in Samsung mobile phones as a pre-installed storage cleaner in the device settings, from where it sends data packages to Chinese servers."

Definitely not a company one would expect to report vulnerabilities. Also odd that they would be find Firefox issues given their browser uses IE and Chrome renderers.