我的双飞燕鼠标的边键在firefox下无法前进后退，很不方便。查一下xorg.conf multibuttons 大概步骤如下：
1. sudo apt-get install imwheel
2. 修改一下xorg.conf的配置。sudo gedit /etc/X11/xorg.conf
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ExplorerPS/2"
Option "Buttons" "7"
Option "ZAxisMapping" "4 5"
Option "ButtonMapping" "1 2 3 6 7"
EndSection
protocol 改为"ExplorerPS/2"
buttons 改为7，原来为5
3. 修改imwheel自动在图形的时候启动
sudo vi /etc/X11/imwheel/startup.conf
# Set this to "1" to make imwheel start along with your X session.
IMWHEEL_START=1
#这一行把注释去掉
IMWHEEL_PARAMS='-b "0 0 8 9"'
4. sudo vi /etc/X11/imwheel/imwheelrc
增加下面两行，为了定制在firefox里向前向后的功能。
"^firefox$"
None, Thumb1, Alt_L|Left
None, Thumb2, Alt_L|Right
退出登录，再ctrl+alt+退格键重启gnome. 再进来，打开firefox，边上的向前向后键就启作用了。
