在ubuntu下启动firefox报错 Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.
解决：
终端输入
killall firefox
【ubuntu firefox】 Firefox is already running, but is not responding,布布扣,bubuko.com
【ubuntu firefox】 Firefox is already running, but is not responding
原文：http://blog.csdn.net/u011102951/article/details/34101771