Border on a row within a table border-collapse

Question

Very strange things I see in FireFox.

http://www.freeimagehosting.net/image.php?c82dd67985.png

http://screencast.com/t/M2M1NDYx

http://screencast.com/t/YTk4OWYxYj

http://screencast.com/t/NTk3YTEwZTQt

I am trying simply to have border on a row within a table border-collapsed. This my styles:

.result .class.list { border-collapse:collapse; width: 100%; }
.result .class.list tr.selected { border: dotted 1px #000; }
.result .class.list tr { border: solid 1px #fff; }