>>>That's like the fine distinction between disc and disk - and nobody uses disque, because they'd risk the appearance of a pinque guy who'd say "it's actually risque, don't you thinque?".
>>>
>>>Thunderbird's spellchecker (set to US English) redlines dialogue, monolog and epilog, while dialog, monologue and epilogue are OK. No logic, just a list of exceptions, aka dictionary.
>>
>>Thunderbird's spell checker is an ongoing source of amusement for me. I think whoever put it together did it as a project for an ESL class.
>
>Now I see that I actually meant Firefox, but the difference may as well be not there at all; they may share the engine and the dictionary.

Probably so. I didn't even realize Firefox has one. Why would you need a spell checker in a browser?