Merge pull request #8081 from crdlc/bug-840990

Bug 840990 - [Facebook Import] Reflow in alpha scroll [r=jmcanterafonsec...(cherry picked from commit 3aaed63c46bc8c89892a45afab3007f44bf3e63f)
(cherry picked from commit c7a0368503f2fa7c96d6860182074e49b94a4d68)