What would be the point? It only picks up words which are not other words? ie it would accept accept if you meant to say except. Or their instead of they're or there. I could go on for weeks...or weaks. But I won't!
You can't add a spellchecker to AB, per se. (Only AB's techies could do that, using code that's vulnerable to attack and taking lots of bandwidth and processing power; it's not going to happen). But any decent web browser should have a spell checker built into it. Firefox certainly does.
Factor 30 is correct ! I recently changed over to Chrome from Internet Explorer and spell checking comes with it. I never had that with IE. Even as as I type IE and AB are underlined in red.
I am on record here at AB as saying, time and time again, that CHROME is just better in almost every way than IE, and I had been using various versions of IE since 1995 ! I used to defend Windows against all-comers...not any longer though.