Stay-Open Menu is an add-on for Firefox that will keep menu items open, even if you click elsewhere. It is a pet peeve for some, to have to do all this re-clicking if you need to access more than one thing from the menu. This extension enables multiple selections from bookmarks menu, history Menu, or address bar dropdown list, without reopening menu or using sidebar.
When you middle-click a bookmarked item in the bookmarks (or in the history) you will open that web page up in a new tab, and the menu stays open, so you can do more clicking inside of it. You can then click all the links you need to click and open up. Once you are finished, hit the Esc button to close the menus (or you can click somewhere outside the menu, as well). Here is one more handy tip from the developers:
Toggle the about:config value of extensions.stayopenmenu.useCtrlMeta from false to true to enable usage with Ctrl-click. See the homepage for more detailed instructions on how to turn on the Ctrl-click option, and further information about using with the Smart Location Bar.
For more help and support for the Stay-Open Menu extension, be sure to check out this thread: