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The script has no real limit, it simply loops over all the groups that you have joined, so the limit is with Soundcloud and how many groups they let you join - I don't know the answer to that, sorry. In the example shown there are 50 groups.

There is one thing to note though (which I will add to the original post). The more groups you have joined the more resources your PC needs to run the script (it was a quick hack-n-slash job so slightly inefficient) - in some cases on older machines this can cause a temporary browser freeze - if this happens the best thing to do is wait a couple of minutes (at most) to let it run.

Thanks for your interest and support.

Thanks! The only other part I'm having a problem with is saving it as a bookmarklet in my browser (Firefox). Can you give me a quick walk through for doing that? Thanks!

Firstly you need to enable the bookmarks toolbar.
See here: https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars and scroll down (near the bottom) to find the section "To turn on the Menu bar or Bookmarks toolbar"

Once the Bookmarks toolbar is enabled, right mouse click anywhere (where there's empty space) within the new toolbar and choose "New Bookmark". Give it a name, and in the location field paste the JS code from here. Click add. It should show up as the name you have chosen with the default icon of a globe. Then follow the instructions in this post to use the tool.

Cheers.

Cheers! That works! Now just to find out how many groups I can join. I read somewhere that the limit was 75 only according to something I found here https://www.soundcloudcommunity.com/soundcloud/topics/i-get-suspended-from-time-to-time-for-posting-to-too-many-groups-how-do-i-know-the-limit-is

If that is the case then this might not even really be needed. Will still come in handy though cheers!