Last Dictionary for Mail 1.1
by Lemon Juice
This extension will remember the last dictionary used in the Mail Compose window and use it when composing new messages.
About this Add-on
When you first run this extension the default language for new mail is taken from your general spelling preference (SeaMonkey: Appearance -> Spelling; Thunderbird: Composition -> Spelling) - but then this preference will have no influence on your default language for mail (but will still influence language in input fields on web sites in the SeaMonkey browser).
This extension should co-exist well with Dictionary for recipient - if you have both of them installed then the dictionary for recipient takes precedence over the last selected dictionary when composing new mail.
Compatible with SeaMonkey 2.35 and higher and Thunderbird 38 and higher.