However, in KDE running the Firefox as installed from source from Mozilla (due to their licensing, Debian will not include products under the MPL (Mozilla Public License)), fonts never looked very good.
Until I ran this:
$ sudo dpkg-reconfigure fontconfig-configI selected the Autohinter due to not really knowing if I use Bitstream Vera, and I know I don't (choose to) use Microsoft fonts; I chose Always for the LCD question (step two of three), and I chose No for the "Use Bitmap fonts?" question (the last). Then I restarted my X server (the graphical display) with [ctrl][alt][backspace].
Now Firefox looks wonderful. There are other tips in that post but I am pretty happy with this setup, so I am going to leave it be.
I find it odd that the initial Firefox font, Times, is no longer an option, however. Not sure why that would be, but it is the case.
Thanks, Free Software, for making my life configurable!