MAC FireFox > confirmation message when navigating away from (Path B) is not shown.

MAC FireFox Issue

Path I > Go to My Curriki > My Contributions> Add a Resource.> Select radio button to create a resource from scratch.
SimpleWikiResource page will open up.
Enter some fields.
Now click Add a Resource link in the left panel. (Path B)
The Add to Curriki dialogue box will open up instead of the confirmation message asking user if he wants to navigate away from the current page.

Now select any option and click Next button.
Now the following message is shown over a blank Screen.

Are you sure you want to navigate away from this page?
Navigating away from this page will cause you to lose your work.

Press OK to continue, or Cancel to stay on the current page.
Clicking Cancel button will show a blank screen......

Actually this message has to be displayed when the Add Resouce link (Path B) is clicked....... This issue noticed in MAC FF