custom footer” was found in:

Adding custom header and footer to Chameleon galleries

Chameleon will include a header and footer if they are in the GUI (Settings > Header/Footer) or as plain text files named and, respectively, located in an Image Source Folder or the Skin Folder (JAlbum/skins/Chameleon). The header is placed below the control bar and the footer at the bottom of the page. They give further control over formatting, are independent of the rest of the page contents, and can be used in addition to the Custom Link entries on the Chameleon > Album information tab.