extensions directory is used to define plugins which are pre-installed, pre-activated and which cannot be later deactivated, as part of the standard SPIP installation. All that is required is to store the desired plugins in this directory.
In the SPIP standard distribution, some plugins are included by default:
- "Filtres images et couleurs" (Image and colour filters), providing functions for graphical and typographical manipulation,
- "Porte Plume", offering an editor’s toolbar to insert SPIP shortcuts,
- "SafeHTML", for cleaning out unwanted or dangerous items from forum contributions and syndicated site content feeds (RSS).