I’ve seen it … but does this means i have to revert back to winXP just for follow a forum ? … i hope not 
I think here we are not talking about changing the OS of lots of users just for support an unhelpful (and in most cases, unwanted) feature that add nothing except some colors (no security, no functionality, no helps, nothing other than colors) … as i already said, the “colors” feature is the one that breaks the most part of the old browsers, that apparently pass the other two ones, or at least mine pass them (firefox 115 … still, can be helpful if more peoples that have old browsers make that test on github linked above and report here what ones fails, i suppose this can be helpful also for you developers for collect data about what work and what not), so perhaps the more good thing to do is to exclude that feature and integrate the other two ones for test them extensively with old browsers (i think peoples will be glad to help in testing, too) 