Hiroba Extension by Irwan

How to use this extension:

Initial setup
* Access DonderHiroba page at https://donderhiroba.jp/
* Enter your 12 digit friend code number (太鼓番) when prompted

Functionality
* On the song list page, the extension will display the song's BPM, difficulty level, and link to wiki
* After accessing a song's score detail page, the extension will remember your play record on that song, the play record will then be displayed on the song list page
* On the song list page, the extension allows you to filter and sort songs by its difficulty level, crown status, badge status, as well as play record
* On the recently played song page, the extension will add a link to the song's detail page
※ At the moment the extension only works with difficulty level おに(Extreme) and おに裏(Extreme Secret)