Get Rid of Silly Colored Bars in Mozilla Thunderbird

I got a plaintext email newsletter today that included some headers that look like:

>>>>>>>>>>>>>> HEADER

Of course, thunderbird thinks it's clever and wants to render this as a 14th-level blockquoted citation with a large pyramid of stacked colored bars. I decided I'd like to do without the eye candy and finally found a forum posting that tells how. Since it's not so easy to read that forum, here are the distilled instructions:

Add this to ~/.mozilla-thunderbird/*.default/user.js:

user_pref("mail.quoted_graphical", false);
user_pref("mailnews.display.disable_format_flowed_support", true);

Add this to ~/.mozilla-thunderbird/*.default/chrome/userContent.css:

blockquote[type=cite] {
  padding-bottom: 0 ! important;
  padding-top: 0 ! important;
  padding-left: 0 ! important;
  border-left: none ! important;
  border-right: none ! important;
} 

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