You'll be interested to know that Safe Browsing was introduced in Firefox 2 in 2006, and the malware check feature was introduced in 2014! I suggest you search using your favorite search engine to see how this feature works while also preserving the privacy of your URLs and downloads. It uses hashing! Here's a good link, I suggest you scroll down to the Privacy section and read carefully: https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-...