View the mutual friends on someone else's profile. Useful to see if someone knows someone else on your friend's list. You can contribute here: https://github.com/fuzzydragon/Roblox-Mutual-Friends-Plugin If you don't want to use the extension on the Firefox Add-ons store then consider downloading the project from it's Github repository and then installing the extension manually. https://github.com/fuzzydragon/Roblox-Mutual-Friends-Plugin