Learn Helper

- Jobs are automatically sorted by DDL and colored to indicate urgency (blue, yellow, orange, red, black - expired).
- Supports topping (starring) cards and toggling read/unread status.
- Supports ignoring some content in some courses to prevent screen scraping.
- Support for filtering cards, no longer need to search all the way through.
- Add a corner marker for unread count on the plugin bar.
- For more features, see https://github.com/Harry-Chen/Learn-Helper/blob/master/CHANGELOG.md