Update 2.0.0: I've replaced the old MAL API with the unofficial Jikan API Update 1.6.9: Clicking sort options again will reverse the sort order.
Ever wanted to be able to filter and sort your list like the seasonal anime page?
Go to any season page (except schedule and archive), you will notice this link:
If you click on the 'My List' link, the script will start loading all your anime entries:
Once finished loading, you can do anything you want with your list like you can with the season pages.
When you refresh the page, the script will fetch a cached version and you can immediately start sorting and filtering again. If you don't want to use the cached version, press the refresh button in the top right corner and the script will reload your list:
You can also find a 'Seasonal' link on the animelist page itself:
Keep in mind that the performance of this script depends on the amount of anime in your list.