No, definitely do NOT trust. Do NOT download. Do NOT open the download. It's probably malware. There has been a concerted campaign to trick Firefox users into installing malware using an orange page with a huge stolen Firefox logo. The address you see in the address bar usually is some nonsense. They launch a new site every day, which bypasses the built-in bad site blocker. You end up there due to an ad on a popular website. If you have never considered using an extension to block ads, perhaps it's time to consider one. Mozilla recently posted a blog listing some popular ones: https://blog.mozilla.org/firefox/ad-blocker-roundup-5-adblockers-that-improve-your-internet-experience/ Also: [[I found a fake Firefox update]]