Thank goodness for spell checkers.... however when I installed Nx, I found that Firefox was telling me all my spelling was way worse than usual. It would seem that the default setup expected me to be typing "en francais". Fortunately that's easy to change....
Right click on any "text area" (like the one I am using to post this topic) and scroll down to "Languages". If you don't see languages, make sure "Check Spelling" is ticked. Click on your appropriate language and Voila..... If you normally communicate in something like Gaelic you can click "Add Dictionaries" at the bottom of the list.
Not a big thing, but now I can look less foolish than I really am.