A bookmarklet for importing assets to Mediathread.
This bookmarklet could eventually be phased out due to web browsers' Content Security Policies, see: Bookmarklets are Dead. Still, it might remain useful if things change, and for sites with lax security headers.
To add the bookmarklet to Mediathread, run npm pack. This will create a
tarball called mediathread-bookmarklet-1.x.x.tgz. Then you can copy this
file to Mediathread's requirements/src directory, and update
requirements/js.txt to point to the new version.