Does what it says on the tin! If your "Find More" button fails to appear partway down a long list, simply click the extension again and it will continue loading.

Works wonderfully; Just make sure you keep an eye out for non-exact matches rather than clicking blindly. The add-on is helpful and displays these close matches in a different color, with a clear note explaining how the match was found. (In addition to exact handle matches, the add-on will check for matching display names, as well as look in user bios for mentions of the user you're trying to match.)