Changelog:
The Select Addresses dialog came up blank if opened from a Compose window with a single To/Cc/Bcc field filled in (bug 814770).
A change to the User Agent string has been reverted since it caused some website incompatibilities (bug 816749).
Information failed to show on the message header pane under certain circumstances (bug 803322).
The display quality of fonts could be perceived as bad when Cleartype was turned off on Windows (bug 814101).
The permissions database was not read completely if it included an invalid entry (bug 814554).
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