This used to be part of Multiple Tab Handler which was not only programmed to allow multiple tab selections, but had directions for other extensions to be able to tie into it for functionality.

Now that Firefox itself and other browsers can select multiple tabs, it is obvious that this addon is specifically for copying information from the tabs Title and Url along with Metadata such as Description and Author for each selected Tab. Wished I had noticed the %RT% years before which means it can be pasted into RTF areas as well as Text areas. Don't forget the config setting. This definition was and still is one my favorites (and now that I know about the %RT% so much the better)

can't paste code, but
HTML Link with &Desc [LI]

would include target="_blank" and href="%URL_HTML%" and title="%DESC_HTML%" within the anchor, then enclosed within list (LI and /LI) then followed by %RT%

Firefox extensions make more use of context menus, and this one is no exception. No need to have the addon icon on the toolbar. Will just be using the tab context menu and because of that having 21 or more patterns to choose from is not a problem. 5 STARS.