annotation_helper.tmpl references two resources via HTTP on assets.annotateit.org, which no longer exists, and includes jquery via HTTP as well (which should be changed to HTTPS).
On the other hand, it seems that annotation_helper.tmpl is no longer really used; it's still included in some theme, but not used at all. 8dc03e129b171e3fee78e379763e4557339280bf removed notes.css(), and before that, 4dff6741c8d4663f2c626623a9a7a0ea2761ef17 removed most of annotation support.
annotation_helper.tmplreferences two resources via HTTP onassets.annotateit.org, which no longer exists, and includes jquery via HTTP as well (which should be changed to HTTPS).On the other hand, it seems that
annotation_helper.tmplis no longer really used; it's still included in some theme, but not used at all. 8dc03e129b171e3fee78e379763e4557339280bf removednotes.css(), and before that, 4dff6741c8d4663f2c626623a9a7a0ea2761ef17 removed most of annotation support.So I guess this is just a leftover.