Comment 62 for bug 513887

glavkos, since you do have the "mozilla daily build" repo in your sources, I am surprised that you don't have the dom.ipc options in your about:config. What would probably solve the problem for you would be to disable the "mozilla daily build" for a while (until this bug is fixed). Note that in this case, you would have to manually downgrade your firefox to the version from the Ubuntu repos. To do this, open Synaptic, search firefox and click "Package--> Force version" and select the older version from the Ubuntu repos.