These features are from the JS debugging page:
http://getfirebug.com/js.html
The third one from the bottom.
I have Firefox 3.0.4 and Firebug 1.2.1. I tried 1.3 and 1.4 but still
no luck.
I have another add-on that extends Firebug (Firecookie), but I
disabled it and the features still don't appear.
I'm not sure how to upload a screenshot, but all I see when I right-
click on the function name are:
Copy
<a horizontal separator>
Set Breakpoint
Edit Breakpoint Condition...
I've selected an actual JS file from the list of script files too.
Is anyone else experiencing this?