How to get applescript to select a specific preference pane in Firefox

Anyone know how to get Applescript to select a specific pane in Firefox preferences? (Getting preferences to open is no problem.) One big difficulty is that I don’t know what the collection of objects in the top bar of the preferences box is in Applescript jargon. A menu? A menu bar? A tool bar? A group? Or what? I’ve spent a long time trying different strings of jargon but not hit the right one.

Using the arrow keys to select the pane is no good because you’re not always starting from the same place.

Any helpful ideas would be appreciated.