Hi! Thank you for your feedback! That's a good idea about making the logo configurable. I filed an issue for it at: https://github.com/birchill/10ten-ja-reader/issues/689

Also, thank you for the advice about fixing the add-on after the update. I'm really really sorry for the trouble you had.

UPDATE: As of version 1.2.0 the logo is now configurable so you can set a kanji icon if you prefer.