If you absolutely need that one old .xpi extension that doesn’t exist anywhere else, then the old version is your only choice. Just remember: with great customization comes great responsibility.
: It remains one of the few browsers capable of running NPAPI plugins and bootstrap extensions that offer deep UI modification, such as multiple rows of tabs. User Interface waterfox browser old version
Today, you won't find Waterfox Classic on the official download page (it's been relegated to "unsupported" status). But version 2020.10 lives on in virtual machines and on the hard drives of digital archivists. If you absolutely need that one old
After downloading an old version, right-click the .exe > Properties > Digital Signatures. It should say or "Alex Kontos" . If it's unsigned, delete it immediately. right-click the .exe >