Check the CPU usage of the processes and make sure that it is close to 0. If it is close to 1, STOP NOW and ask Benjamin Smedberg for assistance.
For each of the three processes, choose Process -> Create Dump -> Create Full Dump
[[File:Flash-getfulldump-ProcessExplorer.png|Process Explorer screenshot of collecting a full dump]]
After you have collected the data, you should be able to kill the plugin-container process in process explorer to un-hang Firefox.