Splinter: open Firefox in fullscreen mode

Problem
With Splinter you can automate a browser window (click on a button, type in some text, etc). You can also use a Firefox instance beside Chrome and some other browsers. But how to open the Firefox instance in fullscreen (as if you had clicked on the “maximize” button)? Strangely, there is no command-line option for this :(

Solution
Well, under Linux there are some tools that allows you to interact with windows:

• xwininfo
• xdotool
• wmctrl

When the Firefox instance is opened, it becomes the active window and I ask its window ID with “xdotool getactivewindow”. Then, with “wmctrl” I can toggle this window to fullscreen.

Demonstration:

jabba@jabba-uplink:~$ xdotool getactivewindow
109051940
jabba@jabba-uplink:~$ python
Python 2.7.4 (default, Apr 19 2013, 18:28:01) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> hex(109051940)
'0x6800024'
jabba@jabba-uplink:~$ wmctrl -i -r 0x6800024 -b toggle,maximized_vert,maximized_horz

The same in Python is available in my jabbapylib library here.

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