How can I customize error pages in Firefox 24?

I would like to customize the HTML/CSS/JavaScript of all 24 Firefox error pages, i.e. loses connectivity network, DNS and other standard error pages.

There are two files omni.ja in Firefox on Ubuntu 12.04 24:
/usr/lib/Firefox/Omni.ja
/usr/lib/Firefox/browser/Omni.ja

Unpack the first file in its own directory. Then, you can change:
omni.ja/chrome/toolkit/content/global/netError.xhtml

Tags: Firefox

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