At a guess (can't test right now, on mobile) a browser plugin that manipulated CSS might be able to override *:visited, setting the colours to something that wo

At a guess (can't test right now, on mobile) a browser plugin that manipulated CSS might be able to override *:visited, setting the colours to something that wouldn't permit detection -- "inherited" perhaps? Has anyone tried something like this, e.g. with the userstyles plugin? https://userstyles.org/ https://userstyles.org/