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Note:
For SeaMonkey 2.0 and all versions of Thunderbird prior to 3.0 you also need to provide the disablehistory attribute.
enablehistory
New in
Thunderbird 1
Requires SeaMonkey 2.0
Type:
boolean
If
true
, an arrow button will appear on the end of the textbox which, when pressed, will open a dropdown menu of all available results.