Dear Loose Rivets,
I downloaded the aforementioned browser several days ago and though I was impressed with its increased speed and moderately decreased RAM usage, I did not like the monochrome toolbar. If you expand "Tools", drop down to and click on "Add-ons", you may then open "Themes". I found but one - an autumnal leaf display by MaDonna - which I find satisfactory. I expect many more themes which are compatible with Firefox 57 in the near future.
Best,
Ed
