Make sure the "Menu Bar" is showing at the top of the Firefox window by RIGHT clicking in a blank area at the top of the screen, then place a check mark in the "Menu Bar" listing by clicking on it. You should now see a "Bookmarks" item in the upper left. Clicking on the "Bookmarks" item should cause a drop down of all your bookmarks which should only require one click to open.

Hope this helps.

Grif