Comment 4 for bug 909352

The workaround I tried is detailed here (with the difference I'm using firefox instead of chrome):
http://askubuntu.com/questions/52357/uvc-webcam-upside-down-with-google-gtalk-plugin

but didn't work. I tried both paths /usr/lib/libv4l/v4l1compat.so and /usr/lib32/libv4l/v4l1compat.so