In Lubuntu, the font in the window title is set in ~/.config/openbox/lubuntu-rc.xml in the section between <theme> and </theme>:
Code:
<theme><name>AAA111</name><titleLayout>L</titleLayout>
<!--
available characters are NDSLIMC, each can occur at most once.
N: window icon
L: window label (AKA title).
I: iconify
M: maximize
C: close
S: shade (roll up/down)
D: omnipresent (on all desktops).
-->
<keepBorder>no</keepBorder>
<animateIconify>no</animateIconify>
<font place="ActiveWindow"><name>Ubuntu Medium</name><size>11</size><!-- font size in points --><weight>bold</weight><!-- 'bold' or 'normal' --><slant>normal</slant><!-- 'italic' or 'normal' --></font>
<font place="InactiveWindow"><name>Ubuntu Medium</name><size>11</size><!-- font size in points --><weight>bold</weight><!-- 'bold' or 'normal' --><slant>normal</slant><!-- 'italic' or 'normal' --></font>
<font place="MenuHeader"><name>Ubuntu</name><size>11</size><!-- font size in points --><weight>normal</weight><!-- 'bold' or 'normal' --><slant>normal</slant><!-- 'italic' or 'normal' --></font>
<font place="MenuItem"><name>Ubuntu</name><size>11</size><!-- font size in points --><weight>normal</weight><!-- 'bold' or 'normal' --><slant>normal</slant><!-- 'italic' or 'normal' --></font>
<font place="ActiveOnScreenDisplay"><name>Ubuntu Medium</name><size>11</size><!-- font size in points --><weight>bold</weight><!-- 'bold' or 'normal' --><slant>normal</slant><!-- 'italic' or 'normal' --></font>
<font place="InactiveOnScreenDisplay"><name>Ubuntu Medium</name><size>11</size><!-- font size in points --><weight>bold</weight><!-- 'bold' or 'normal' --><slant>normal</slant><!-- 'italic' or 'normal' --></font>
</theme>
And I think that the font chosen there is what we see in the window titles of most if not all programs. So I don't understand why the issue is limited to Firefox.
I forgot to mention that the "smart quotes" in the title of the Launchpad page appear okay for me in Firefox 33 on Lubuntu 14.04 (fully updated).
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