Hi after updating FF to 10.0.2 version recently I started to experience hanging of browser, it became unresponsive on sites like Facebook, very difficult to write letters, as browser hangs, or works very slowly. When I close browser firefox.exe and plugin-container.exe not closing, continue to work in the background so I had to stop their work manually via Task Manager. I updated all my plugins yesterday reinstalled Adobe Flash Player, tried to reinstall browser FF 10.0.2, but problem persists. Just now again hanged in Facebook when no other programs opened. After that I deleted 10.0.2 version and now rolled back to 10 version of Firefox, seems to be working good. For now. Can anyone helped me what could possible cause of hanging and why firefox.exe was not closing properly? Thank in advance.