Location Bar Characters v1.0.1resigned1
                                            
                                        Did you know that when you type special characters into Firefox's location bar (aka: url bar, awesome bar) it filters/focuses the location bar's search results.  For example, enter "%" to show only results from currently open tabs, or "*" for just your bookmarks, or "^" for just your history, etc.
This super simple add-on just provides a toolbar button that displays a panel to remind you what the characters are and what they do.  Here they are:
    ^   Browsing history
    *   Bookmarks
    +   Pages you've tagged
    %   Currently open tabs
    ~   Pages you've typed
    #   Page titles
    @   Web addresses (URLs) 
They can be entered before or after search terms.  Learn more about them here:
https://support.mozilla.org/en-US/kb/awesome-bar-search-firefox-bookmarks-history-tabs#w_changing-results-on-the-fly