The last item checkbox in the referring documents dialog can not be activated

When using windows 7 with firefox 25.0.1 the last checkbox in the referring documents dialog can not be activated.

Reproduction:
1) Create internal links from different news articles in gogreen to a specific new document (at least 5)
2) Open the document to which the other documents linke
3) Take the document offline
4) Select the documents in the referring documents dialog

Expected: when the last checkbox is clicked it gets checked
Actual: when the last checkbox is clicked nothing happens