Hi Keet, I think Firefox decides which side to use for a "fly-out" menu based on how close the drop-down is to the right edge of the screen. Has your bookmarks menu button moved or is it in the same place it was before?

Alternately, what do you think about using the Bookmarks Sidebar? The keyboard shortcut to open/close is Command+B.

The bookmarks button is unmoved. I've tried increasing the width & decreasing it after reading your suggestion, but that had no effect. The Command B must puts the list of options in the space reserved for the bookmarks sidebar, which puts it in the best eye wheelhouse, but on the far left, which isn't much of an improvement, and that is the general reason I had opted to use the bookmarks dropping down from the bar above.

 Thanks for the suggestions.
 Keet