Like many popular text editors, Mozilla supports spell checking as you type. This preference determines whether the feature is active.
Possible values and their effects
Check spelling and highlight errors as you type. (Default)
Spell checking must be triggered manually.
Mozilla Thunderbird 1.5
The checkbox “Options (Preferences) → Composition → Spelling → Enable spell check as you type” toggles this preference between true and false.
First checked in
Has an effect in
- Mozilla Thunderbird (all versions since 1.5 Beta 1)