手軽に実況ツイート君 - YTLiveChatTweet is a free Chrome add-on that allows users to easily live-tweet their comments while watching YouTube Live streams. By connecting their Twitter account, users can have their comments simultaneously tweeted as they comment on YouTube Live. This tool is particularly useful for Vtuber livestreams, as it helps facilitate "live-tweeting with tags" by allowing users to set hashtags for their comments.

With this add-on, users can watch livestreams without the distraction of having to switch to a separate window or use their smartphones to tweet. By simply commenting on YouTube Live, their comments will be automatically tweeted with the specified hashtags.

Please note that the developer of this add-on is not responsible for the content of the tweets sent using this extension.