Just wanted to mention that I (original reporter) cannot reproduce this
bug right now because the original system was reinstalled. Dasher on my
other systems is crashing before even getting to this point. So someone
else should attach fonts that are causing their crashes.

However, I don't think the answer lies inside any font file. I think it
has to do with unreadable font files. There are other reports (#139875,
#152609) of pango, crashes, and unreadable font files. I can verify that
Firefox will go haywire when there are unreadable ttf files in
/usr/share/fonts/truetype/msttcorefonts. It recovers when the
permissions are fixed (or Pango is disabled with MOZ_DISABLE_PANGO=1).

Apparently, the msttcorefonts package has at one time or another
installed its files mode 440. Thus they are readable only by root. This
bug MAY be caused by that.

Try the following:

sudo chmod 0440 /usr/share/fonts/truetype/msttcorefonts/*.ttf

Then run Firefox or Dasher and try changing your fonts.

-- 
dasher segfaults when changing alphabet
https://bugs.launchpad.net/bugs/118533
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