Firefinder + Firebug + Firepath
Most of us use firepath along with firebug as an add-on to find appropriate xpath locators.
Firepath - This add-on helps you find both the css and xpath locators.
Just like firepath you first need to install Firebug, then Firefinder.
How is it different from firepath?
It's more of an evaluate your css or xpath tool.
Happy Inspecting in the new year :)