Some application windows (such as Firefox windows) may load behind the
currently active window, causing you to need to switch to the window you just created to
focus it. To fix this behavior add
this to your ~/.config/openbox/rc.xml file, inbetween the <openbox_config> and </openbox_config> tags:
<applications>
<application class="*">
<focus>yes</focus>
</application>
</applications>