That's the one thing that I miss, too. Right now, as I'm typing this post, I'm on Mint, which has FF 3.6.15 as it's default browser, which does have an excellent spell checker. I do have Opera installed, both on Win 7 & Mint, at first, I was having to use it some on 7. It's actually a good browser, and has a speed booster for those who has slow internet connections. It's actually a better browser that it's usage figures suggests.
A dependable, real time spell checker is a must. I used to be a good speller, but meds for my condition kinda clouds my brain a little.
And continually having to lookup words in this paperbook dictionary slows me down, sometimes to the point that I'm forgetting what I'm even thinking about to begin with.
I'll continue to seek a solution, but I'm also going to make a suggestion to MS about this. While they don't personally answer every email, all suggestions are read and those that have merit are considered by the Windows team for future development.
Cat