With latest WindowBlinds version 8.09, firefox 34.0.5 crash immediately at startup.
I've narrowed it down to the addon : Anti-Aliasing Tuner 14.12.03.01.
https://addons.mozilla.org/en-US/firefox/addon/anti-aliasing-tuner/
Which is the latest version for the addon.
When exluding firefox in WindowBlinds firefox works again.
If disable the addonon , it also works.
With earlier Windowblinds version this didn't happen.
