For the latest version of Firebug (1.12.5.) I can't view the HTML and CSS panels side by side, whether the screen panel is on the top, bottom, left or right. Currently, I can view one panel at a time. Plus, the corresponding CSS line numbers are now gone.
I've reinstalled it several times but no luck. Maybe I'd need to turn off other plugins to see if one is causing the issue, but I haven't tried that yet. Maybe there's an easier way. Has anyone experienced this issue and resolved it?
Two issues really: (1) no simultaneous side-by-side viewing AND no line numbers listed on the CSS panel.