It can become a nuisance when you want to click on multiple items in a menu inside of Firefox and right before you get to click that second or third link, the menu disappears and you have to go hunt it down again. If you want to make your menus stay open then you need to pick up the Stay-Open Menu add-on for Firefox.

With this addon you can lock your menus in place so you can go in and select multiple items before you are ready to close. Here are a few additional notes from the developer:

• Middle-clicking each Bookmarked item in the Bookmarks Menu will open it in a tab, while leaving the menu open for further selections. (Left-click the desired menu to open it, find the items you wish to open, then middle-click each desired item to open it in a tab.) When you are done making selections, click somewhere outside the menu (or press ESC) to close the menu.
• Also works in the same way with the Bookmarks Toolbar. This applies to the new ‘Smart Bookmarks’ as well, since by default it is a folder residing in the Bookmarks Toolbar.
• Same functionality in History Menu (added in version 0.5).
• The Bookmarks Sidebar stays open by default even without this extension, but I prefer the Bookmarks Menu because I like the way the folders automatically open when hovered.

You can pickup Stay-Open menu on the developer’s web site or if you have a login to Mozilla’s Add-on site you can pick it up there too.