[Bug 749440] Re: Incompatibility with Thunderbird addon CuteButtons - Crystal SVG : makes TB crash when reply a mail

[Chris Coulson]

Ok, so what this extension appears to be doing is setting list-image-
style to a large image (mosaic.png), and only clips it with -moz-image-
region under certain conditions (ie, when it's visible to the user).
Having list-image-style=mosaic.png with no -moz-image-region is what
breaks it, because it means we set the icon to the whole mosaic.png
image, which is a pretty big file.

I think the only thing I can do is just disable icons when they are
unusually large. In any case, this extension isn't going to do what you
expect for menus with globalmenu-extension (we don't get any hover
events from the menu for example)

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https://bugs.launchpad.net/bugs/749440

Title:
  Incompatibility with Thunderbird addon CuteButtons - Crystal SVG :
  makes TB crash when reply a mail