Advent of Code Part 2 Timer

Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. This inserts a new column on the personal stats page: https://adventofcode.com/<year>/self With version 0.0.3, this extension will also attempt to track the first time you open a puzzle and offset your completion times based off of that start time. Note: You must generate a private leaderboard in order for the extension to work. See: https://adventofcode.com/<year>/leaderboard/private