I’ve just downloaded EmEditor and I just had to post my initial views. I have long been a user of Textpad and never thought I would find a competitor, but EmEditor is really good. I have only played with it for a few minutes, but it is very intuitive. I easliy added Firefox as an additional Tool and particularly like the Web Preview and WordComplete and Exploer Plugins. I cannot find out, however, how to make replace IE with Firefox as the Web Previewer, but will keep trying.
WebPreview plug-in uses the IE control, so it cannot replace IE control with Firefox. I don’t know if there is a firefox control available for developers. If there is one, I might make a Firefox plug-in.