Field with Link Picker does not open picker on select in Firefox

Reproduced on Firefox 38.0
Steps to reproduce)
1) Open GoGreen CMS and go to the content perspective
2) Open a document with mirror link. For example: /content/documents/hippogogreen/common/banners/green-printing
3) Edit the document
4) Click the 'Select' button for the hippo mirror field

Expected: Picker opens
Actual nothing happens. No js log or server log.
Works as expected in Chrome