FB 2.0.11 Question re' diagnosing possible FB bug w/setting breakpoints

[Eric Podietz]

I am using FB 2.0.11 and FF 39.0.3, have been happily using FB for 2+ years. After a couple of months, I got back into a project requiring FB and I am having great difficulty setting breakpoints. I have disabled all add-ons/extensions and created a new profile yet the problem persists.

I am able to set breakpoints in JS that is included externally. However when I try to set a breakpoint in inline JS by clicking next to a line number, instead of the solid red circle icon, I either see no icon at all, or a quick flash of what looks like the spinning arrow icon. There is no indication of a breakpoint having been set in the breakpoint panel.

Has anyone seen this behavior before? What is FB trying to tell me?

Thanks!