Installed HMPA 3.5.2 build 558 pre-release. It is still causing firefox to freeze. Have to click firefox tray icon and select close. The select close program when windows prompts to Close or Wait. This happened on 2 PCs.One a desktop and one a laptop. Both Win 10 anniversary. If HMPA is uninstalled, the problem goes away. this has happened with the last several versions. I am running the 64 bit version of firefox.