No, FF can not type in lowercase unless I re-enable the cap-locks-conversion program I wrote a few years ago. When a post was saved, the program searched the text and converted all capitol typing to sentence case. I wrote it on a rainy day because I can.
I disabled it because it encouraged the likes of raceweenie to become a self appointed typing cop and ban FF from other sites.
Oh yea, I like the dam as long as it is indigo blue.