Drag and Drop - Two clicks are needed when dragging an image to a dropzone

Description

On Firefox when dragging an image to a drop zone two clicks are need first to "pick-up" the image second to drop it.

Issue is reported in: https://h5p.org/node/229008

Environment

Firefox version 59.0.2 (64-bit)

Acceptance Criteria

None

Status

Assignee

Thomas Marstrander

Reporter

Bienvenido Villadelrey

Funding

None

Code reviewer

None

Released

None

Time tracking

0m

Fix versions

Sprint

None

Priority

Medium