Question

What is causing this strange jumping effect in FF4 (see sliding down latest jobs)?

http://jsfiddle.net/ipavelek/2dMNb/2/

Everyhing works fine in Chrome/Safari.

Note:
Setting height for .media to 45px fixes this particular case, but doesn’t solve the problem.

Answer 1

I had a similar problem with jQuery slideDown in Firefox. I also think the issue is with calculating the text dimensions. I added this to element:

.element_to_slide {
   width: 100%;
}  

You would not normally need that if your wrapping div has overflow:hidden or overflow:visible or something else to force element to expand to whole width.

Hope this helps.