TO REPRODUCE: 1. Open the Contacts app. 2. Click on the Settings (gear icon) button. 3. Click on the "Sync friends" checkbox or on the "Update imported friends" button if already authenticated in Facebook. 4. The Facebook contacts are loaded and shown in a list. 5. Scroll the list. OBSERVED: 6. The 'Deselect all' and ' Select all' buttons on the lower part of the page disappear although the space seems to be kept. EXPECTED: 6. The list is scrolled leaving the 'Deselect all' and ' Select all' buttons on the lower part of the page.
FYi, this is also reproducible on v1.3 buri 01/13 build: Gecko-e2c75e8 Gaia-1f029aa