Finally got sick of the way that Firefox under Mac handled tabbing in web forms. It had an irritating feature where combo boxes are “skipped” when you’re tabbing from field to field. It turns out it’s a default setting… In about:config change (or create) the setting accessibility.tabfocus and set the value to 7. Works like a charm. Yay for simple fixes. Now, why the default release of Firefox for Mac doesn’t include this is beyond me.
Here’s the thread that Google finally turned up.