I have been using this Add On for a long time but never had any issues.
Recently, It has started to create an issue.
It says, '' UNEXPECTED ERROR OCCURED''.

I don't know what to do now.

Ok

Awesome use of Firefox`s containers. If you want to use two logins on one site or dont trust a site, this feature makes Firefox`s container isolation very easy to use!

This fixes the official Multi-Account container extension's main weakness.

You can use this extension's "Isolation" setting so than when you click on a result in a search engine, for example, it automatically loads the new site in a temporary container instead of loading in the search engine's container.

Now Google can't follow you to the sites you open through its search results.

this add on has changed my life, love it. it needs way more hype!!!