to any component in html when i add tool tip text by alt="my tool tip text". it works in other browsers but not in fire fox. why. is there a way to enable it in firefox
alt != tooltip
Here you can see why Firefox doesn't display the tooltip. Long story short, the alt attribute does not have anything to do with tooltips. It's just gotten into fashion over time, probably due to IE.
However, there are Javascript workarounds for displaying the tooltip anyway, but I suggest you take a different approach.