On adding chinese input (
ibus-pinyin etc) on ubuntu desktop, chinese text in the browser tabs became scrambled.
To get back legible tabs, remove the offending fonts:
rm /etc/fonts/conf.d/65-droid-sans-fonts.conf fc-cache -f -r
In my case it was
65-droid-sans-fonts.conf, but I suppose it could be other fonts that was installed with the browser too.
(edit) Or, reinstall the droid fonts:
apt-get purge fonts-droid apt-get install fonts-droid