Have trouble remembering the special characters that focus the location bar’s results? When you want to search only in bookmarks, or history, or open tabs, etc.? With this add-on they are only a right-click away in a context menu.
Here is more information about Location Bar Characters from the developers:
This add-on adds options to the context menu of the location bar (aka awesome bar) that allow you to easily insert the special characters that focus the search results ( ^ * + % ~ # @ ). For example, when you only want results from bookmarks ( * ), or history ( ^ ), or open tabs ( % ), etc.
While it is obviously quicker to just type them in, you may not remember all of them at first. This add-on helps you learn them by making it easy to use them. The more you use them the quicker you’ll learn them. Just right-click on the location bar and there they are. Once you can easily remember them you won’t need this add-on anymore.
Want to learn more? Check out this add-on at the Firefox Add-ons website.