Old experiences were served using dangerous and harmful mechanisms that, in 2019 and beyond, can be exploited remotely to takeover your computer. Technical exp

Old experiences were served using dangerous and harmful mechanisms that, in 2019 and beyond, can be exploited remotely to takeover your computer. Technical experts have demonstrated that they’re able to locate and run older releases of browsers, endangering themselves and others by running them unprotected, directly on their primary devices, without protection. Chrome speaks out against that practice here, and I would expect Firefox did the same during the old-to-new extensions transition. The only safe way to access old experiences will likely end up being: install and use old browsers in sandboxed virtual machines that discard all changes at shutdown. While infinite resources would permit browsers to implement virtual machine support for their own older selves, no browser has infinite resources to work with. Happily, since those who desire this most are often technically skilled, my described “set up a safe virtual machine” is easy and realistic. TLDR: Please don’t run old versions of any browser on your primary computers. Use sandboxed virtual machines if you must so at all. The web is far too dangerous and those reading this comment are far too likely to have exploitable commit access to the world somehow.