Mozilla: Sothink Web Video Downloader 4.0 and Master Filer had slipped through security check-in. Both extensions were infected with Trojan horses designed to hijack Windows PCs. Mozilla removed both extensions from its official add-on download site last week. Mozilla has never said whether it was in contact with the developers of the two add-ons prior to removing them from its site. The admission comes a week after Mozilla said it had been wrong about Sothinks Web Video downloader.”]
Source: https://www.csoonline.com/article/2124830/mozilla-retracts-firefox-add-on-malware-claim.html