To uninstall the Structure Snippets plugin:
To completely remove the plugin files, delete the StructureSnippets*.* files from the Pubs-Tools folder located in the main FrameMaker folder.
To just disable the plugin, you can “comment out” the Pubs-Tools line in the INI file by adding a semicolon at the beginning.
;Pubs-Tools:StructureSnippets=Standard, StructureSnippets, Pubs-Tools\StructureSnippets_<ver>.dll, structured