This is a user script for joining all public Steam groups directly from a visited profile.
To install the user script, follow these steps:
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Install a Browser Extension: Install Greasemonkey for Firefox or Tampermonkey for Chrome
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Install the User Script: After installing the extension, you can install the user script by visiting the following link: Userscript.
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Join Groups: Once installed, you can visit a Steam profile page. The user script should automatically run, and you should see the additional functionality to join all public Steam groups.
I wrote this because the script from KnifesFTW doesn't work anymore.