This is a third-party script/app and is not created by the WaniKani team. By using this, you understand that it can stop working at any time or be discontinued indefinitely.
If you find the hiragana in WaniKani lessons too small to read comfortably, this script may help.
By default, it increases the font size of hiragana characters by 80% in the Reading section where new vocabulary is first introduced, and by 50% in the mnemonic and extra study sections.
Installation: get it here