Adjusting width of dropdown in Firefox

[Kelemvor]

Howdy,

I have added an RSS feed to the Bookmark toolbar in Firefox. When I click it, the dropdown window is relatively skinny and it cuts off most of the names of the topics it shows me. Is thee any way to configure how wide to have FF make that bar when it shows the dropdown? I'd like to make it wider so i can see more of the headlines in the window.

Thanks.