To appear in the Composition Toolbar of the Write: … window:
It's achievable with more complex extensions such as LanguageTool … All Rights Reserved there, I wonder whether something in their copious GitHub area can offer a clue to what's required.
In any case, there'll be Thunderbird-provided documentation, which I should find for readers here.
Please, can Special Characters be made compatible with Thunderbird?
To appear in the Composition Toolbar of the Write: … window:
It's achievable with more complex extensions such as LanguageTool … All Rights Reserved there, I wonder whether something in their copious GitHub area can offer a clue to what's required.
In any case, there'll be Thunderbird-provided documentation, which I should find for readers here.