Comment 28 for bug 239182

Requesting blocking 1.9.0.2 because both swfdec and Adobe now have
windowless-capable Flash plugins available (though Adobe's at least is still in
beta), and moonlight also has a windowless plugin.

The number of affected sites is hard to estimate as there is a race condition between reflow and plugin instantiation, but definitely high enough that we can expect plenty of users to hit this when they upgrade their plugin versions.