I don't know since when I have it, but I can't delete it... it's not in the Addon Folder, WTF or on the Login Screen Addons but still it's showing in game! Can somebody help me? Since I have it Location_Fu don't appear in the Fubar..
It's the configuration interface from the Rock framework - FuBar, Cartographer and several others are based on it. Use the drop down on the upper left to find the AddOn that you want to config. It picks up most Ace2 Addons as well.
Your LocationFu is likely to be still loaded. It just isn't showing up properly on your FuBar, and is showing up as a 1 pixel wide button. This is because an old version of LibFubarPlugin-3.0 had defaults of "show icon" and "show text" as nil and nil, so nothing shows up on first installing the upgraded version of LocationFu.
You need to go to your LocationFu options and toggle these 2 settings. You can hide the Addon Preferences button from the Addon Preferences configuration.