As a low vision person and a teacher that uses canvas in my university, Canvas has remarkable erros using Dak Reader. I use Dark Reader since many years, and it used to work almost perfect.
If Canvas is not prioritizing accessibility, which it looks weird to me, then, at least, must be compatible with a popular expansion like Dark Reader or recommend any other.
Some of the error that canvas does use Dark Reader include: invisible text in body of misses, and inisible change of text color also in messages.
So, please, Canvas developers, do the effort-
Many Many thanks for the great work!
jaume