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To test the script, go to any person's steam profile. Wait a few seconds and refresh the page. You will see that you've joined all public groups of that person. If you think you have not joined all groups of people, just refresh the page again and again. Sometimes, it can't be a little glitchy but just refresh a few times and it should join all of them.

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There may be situations in which you've not joined everyone group this person is within. This can be caused by the fact that some groups are private. Also, sometimes the script may not detect all of the groups. So do not forget to refresh your page a few times.