Firebug : display function return value from hover navigation

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Hello,

When I add a breakpoint, I want to watch the return value from the
function of my object.

In java for example, I hover the object with the mouse, then navigate
to the function and I click the "refresh icon" to display the data
returned by the function if it can.

I can't do the same with Firebug. To bypass the problem, I must add a
watch each time and format the value.

Maybe I don't use the debugger in the right direction.

Thanks in advance for helping to debug my code or develop such a
feature.