For bugs in Firefox Desktop, the Mozilla Foundation's web browser. For Firefox user interface issues in menus, developer tools, bookmarks, location bar, and preferences. Many Firefox bugs will either be filed here or in the Core product. (more info)
Right now we don't have any context menu when you right click on a line number, but all of the context menu items that you get when you right click on the line itself seem relevant.
One of those small paper cuts that bleed you to death.