It's not possible to select an item in the Content Tree - when clicking the checkbox user is redirected to clicked item instead. Occurs only on Firefox.

Steps to reproduce:
1. Login as admin
2. Go to Content -> Content Structure
3. In the Content Tree try to select an item (hover over it and select a checkbox)

Result:
The item is selected, but user is redirected to the Content View of selected item.

Expected:
User is not redirected anywhere.