If I log in to my account that includes my name, will my previously anonymous device now be associated with my account? What if I do the same in TailsOS?
One more option I forgot to mention, if you’re not really worried about your security, this is more of a nice to have:
Some VPN software like mullvad browser extension Will let you set site specific VPN exit points. So you could have multiple profiles of Firefox or even Chrome running, each with the browser extension, each specifying different VPN exit points. I wouldn’t consider this high security, but for having two social media accounts coming from two IP addresses with separate browsers and separate cookies this will work
Under the hood, it just uses different socks proxy servers that known IP addresses, so you could set it up without using the extension, but the extension makes it really easy