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Preferences Window is Too Narrow

If the Preference window is too narrow and some of the contents are not visible, try this workaround:

1) Quit Postbox

2) Find your profile directory (see http://support.postbox-inc.com/forums/78362/entries/69230 for details.)

3) Create a chrome directory under your profile directory.  Something like:

macOS: ~/Library/Application\ Support/Postbox/Profiles/<random>.default/chrome

Vista: C:\Users\<user>\AppData\Roaming\Postbox\Profiles\<random>.default\chrome

4) In the chrome directory, create a plain text file named userChrome.css with the following contents:

/*
 * Do not remove the @namespace line -- it's required for correct functioning
 */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

#MailPreferences {width: 60em !important;}