I had an update issue with my recently bought Win10 system and trying to resolve that issue, I mucked Win10 up completely - which has ended with me doing a clean install.
One of the things I had was a spell checker, which underlined in red, any words not in it's dictionary, right clicking then offered the correct spelling - it was particularly usefull, but not I don't think restricted to Firefox. In other words it checked every word I typed, but I have forgotten what it was - I didn't need to call it up, it just worked invisibly. Anyone have any idea what it was?
I have Word 2019 already installed, if that makes a difference.