As the name suggests, content plugins run inside Joomla articles, or the com_content component.
If you're using Joomla 3 and above, it's now very easy to run content plugins in Custom HTML Modules.
- Create a new Custom HTML Module (or Edit an existing module):
Extensions > Modules > New > Custom HTML
- Suppose you're using the googleMaps plugin, enter the code in the text area of the module:
- Go to the 4th tab "Options". Set the 1st field "Prepare Content" to "Yes".
- Click "Save and Close".
Your plugin should now run inside your custom module!