Description
QuickTime VR (also known as QuickTime Virtual Reality or QTVR) was an image file format developed by Apple Inc. for QuickTime. It allowed the creation and viewing of photographically-captured panoramas and the exploration of objects through images taken at multiple viewing angles. It functioned as a plugin for the standalone QuickTime Player, as well as working as a plugin for the QuickTime Web browser plugin.
(Source: Wikipedia QuickTime VR page)
Apple officially abandoned the platform and dropped the plugin from QuickTime in 2015.