The extension currently highlights tones. It may be useful to have options to instead highlight things like:
- high-frequency words, or words whose rank by frequency is in some user-specified range.
- words that do not currently appear in the user's flashcards, optionally also within some frequency range
- parts of speech? Though I'd expect highlighting of this sort to be better-suited for languages with many declensions (e.g., highlighting imperfect subjunctive verbs in Spanish or something).
The extension currently highlights tones. It may be useful to have options to instead highlight things like: