According to this post on the EasyList forum, the following filter blocks the ads on this site. If it stops working, the commenter suggests watching anime on KissAnime or 9anime instead of Crunchyroll. Both are free and don't include ads.
Note: If you use this filter to block ads on Crunchyroll.com and you start seeing "flashing" in the video and yellow ad markers in the stream timeline, here's why.
- Click the AdBlock button and select Options, then click the CUSTOMIZE tab.
- Click Edit to open the custom filters box.
- Paste the filter below exactly as given.
- Click Save.
- Reload the page you're trying to view.
Copy this filter: