Replays Twitch chat for the anime marathons.
Features include:
Support for Crunchyroll marathon.
Support for RWBY marathon.
Support for multiple showings.
Dark mode.
VLC automatic syncing.
For much more information see the website, or check out the source on github.
https://www.TwitchChatReplay.com
https://github.com/ahabyss/TwitchChatReplay
NOTE: This extension is in beta, some anime are still unavailable.