Found in betalabs.
Start a new topic in FF37 with VE open by default. In VE CE area the following image is displayed
<span class="ve-ce-branchNode-slug ve-ce-branchNode-inlineSlug"><img src="data:image/gif;base64,R0lGODdhAQABAADcACwAAAAAAQABAAA" style="width: 0px; height: 0px;" class="ve-ce-chimera"></span>
If you click again in VE CE - the image disappears.