You will need to install a user script manager extension to install this script.
Libreddit instances are struggling under the new Reddit API limits. Many of them are returning rate limit errors. Use this userscript to easily hop between instances to mitigate this.
https://greasyfork.org/en/scripts/470864-new-instance-button-for-libreddit/ is set up to automatically pull from this repo (using webhooks) to update.