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It's very annoying especially when closing tabs in a browser. If a middle mouse button is pressed to often then you accidentally minimize a browser's window. That's not ok.

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To disable window minimizing on middle mouse button, run the following command in terminal:

gsettings set org.gnome.desktop.wm.preferences action-middle-click-titlebar 'none'

To revert it back, run:

gsettings set org.gnome.desktop.wm.preferences action-middle-click-titlebar 'lower'

To disable browser's tab to close on middle click, see:

You can also to use xbindkeys. To install it, run in terminal:

sudo apt-get install xbindkeys

Then the next two lines must be placed in ~/.xbindkeysrc file:

""    #don't do nothing
b:2   #mouse button 2

And finally, you must to clear current bindings with killall xbindkeys and then just execute xbindkeys to restart it.

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should I reboot after that? – dhblah Aug 15 '13 at 10:54
@dhblah No, you don't need to reboot. You can check immediately the changes. – Radu Rădeanu Aug 19 '13 at 20:23
@RaduRădeanu Nope.. the first of your suggestions does not work immediately. Some kind of restart or other action seems to be required. – donquixote Dec 16 '15 at 14:47
After logout + login it works. – donquixote Dec 16 '15 at 14:52

To disable the window rollup on mousewheel feature: Open the Settings Manager Scroll down to Other and select Settings Editor

Select the xfwm4 option, and uncheck the mousewheel_rollup option. This should stop window shading when you accidentaly use your mousewheel near the titlebar.

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should I restart after that? – dhblah Aug 13 '13 at 7:28
actually, it prevents rollup when i scroll up near the title bar, that is nice feature, but I need to disable windows minimize on middle mouse button clicked. – dhblah Aug 13 '13 at 7:30
There should be a different setting for middle mouse button click. – dhblah Aug 13 '13 at 7:31
The question is about middle mouse button click, not about rollup on mousewheel. – Radu Rădeanu Aug 19 '13 at 20:25

To expand on Radu's answer, for those of us who actually want the windows to minimize instead of be sent to the background, this works:

gsettings set org.gnome.desktop.wm.preferences action-middle-click-titlebar 'minimize'
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