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["S. Christian Collins" <s.chriscollins@xxxxxxxxx>]

I filed a Mozilla bug report about this here:
https://bugzilla.mozilla.org/show_bug.cgi?id=1204694

I also created a video showing how I can reproduce this bug every time
in Thunderbird: https://youtu.be/ybkVPSfiNJs

The bug seems to be related to the spell-check-as-you-type feature, but
may be related to the graphics driver as well, as the bug occurs on my
laptop (Radeon open-source drivers) but not my desktop (NVIDIA
proprietary drivers). More info can be found in the bug report I linked
above.

** Bug watch added: Mozilla Bugzilla #1204694
   https://bugzilla.mozilla.org/show_bug.cgi?id=1204694

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https://bugs.launchpad.net/bugs/1301225

Title:
  Parts of Text disappear in Firefox and Thunderbird Editors /Text Areas

Status in firefox package in Ubuntu:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  System info:
  Firefox 28
  Thunderbird 24.4.0
  Ubuntu 13.10 64 bit

  When I edit text in Firefox or Thunderbird,  parts of this text
  (usually entire rows above the cursor) seem to disappear while I type.

  This happens e.g. when I edit an email message inThunderbird, or edit
  a Jira comment or a Wikipedia page in Firefox.

  Sometimes the 'opposite' happens, i.e. a row is copied, so it is shown
  twice.

  The text is not really gone; I can restore it by selecting it (e.g.
  with Ctrl-a). I.e. only the text display is affected.

  The behavior is not quite reproducible. It does happen frequently, but
  I can't reproduce it exactly by typing the same text again.

  I had never observed this behavior before the latest Firefox upgrade.

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