Can you install a newer version of Firefox instead? Why does your Mac not let you install an up to date version of Chrome? What constitutes "too old"?

I went to try to download Firefox, but once again my computer is too old to download any version of it.  What I mean by too old is that Chrome/Firefox no longer supports the operating system that my computer runs (OS X 10.6.8).  So I really can't run my own Local Router.  Do you have any idea why the Cloud Router isn't working for me?

Okay, I downloaded the Local Router on my other computer (the one that the Cloud Router already works on) and it worked just fine.  Originally I thought the Cloud Router was broken because it only got to about 50%, but I had the same results on the Local Router.  After rearranging a few things I got up to 90%, but it never finished.  I guess my design was just too complicated.  I did end up finishing the routing by hand, but with a few more vias and lengthy wires than I'd prefer.  Oh well.  I'm still not sure why the Cloud Router doesn't work on my Mac.  I'll manage for now.  Thanks for the help!