Logos and/or menu items or are not rendered on many websites on Linux.
Please see attached images for details.
Tagging as regression, as this issue was not reproducible in previous FX 9 runs.

To reproduce, load into WebView one of the following websites:
about.com
apple.com
aol.com
bbc.co.uk
constantcontact.com
dailymotion.com
live.com
mail.ru
nfl.com
nytimes.com
paypal.com
skype.com
stackoverflow.com
usatoday.com
walmart.com
weather.com
weibo.com
windows.com
wsj.com