I'm using Gnome Shell with the Dash To Dock extension, but Ubuntu Unity has the same issue:

I use firefox as my main browser and want to use the firefox developer edition for, well, developing.

But even though these 2 use separate binaries their windows are grouped in the taskbar.

This is so incredibly annoying, is there a way to turn this off and only group by binary location?

1 Answer 1


I had to manually override the X11 WM_CLASS, which you can do as an argument to the firefox binary:

/opt/firefox-developer/firefox --class=firefoxdev

I just added this to the .desktop entry and now I have a separate firefox taskbar entry.

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