Am I the only one who sees it spell check in real time as I type my post? Whenever I spell anything incorrectly it immediately puts a light underline in red under my incorrect word, which I can right click and choose the correct spelling. Just like when you are typing a document in MS Word or other word processors.
I thought it was a cool new feature of this forum, but maybe it's something about my system, instead. It doesn't do this on other forums, though. Anyway, I love this feature.
Since I downloaded the most recent update of Firefox (126.96.36.199) (turns out I was running an older version) I also have a spell checker for forms and forums like you describe... 'realtime'. It is not a feature of TFP. I love it, too!
I used to use the google one, but would always forget to click it before submitting a post... same thing with the one for TFP.