Yup. I found that Firefox does incredibly well at long text documents and tables. I remember that Google's internal source code browser would warn you if you tried to open a "large" file (I don't remember what the threshold was). However with Firefox the files always opened fine and things like scrolling performed well. I thought the warning was just a relic of an earlier time. However I realized that my colleagues using Chrome would actually respect this warning and download the file to open it in a text editor. Testing showed that the files would truly grind Chrome to a halt. It seems that Chrome still has a performance edge on highly dynamic content but Firefox does appear to be significantly better at large pages of mostly-static content like long HTML and text documents.