Sometimes, when composing an email message, the words appear in a separate "Spotlight" window, as if I had asked Spotlight to search for them. Very frustrating.

This question is being posted by me on my husband's behalf. He uses Thunderbird, but is less adept than I am, so I'm giving it a try. My question, above, pretty much covers what's happening. As he is typing the email message he wishes to send, all of a sudden, the words begin appearing in a Spotlight search bar which just pops up without being knowlingly engaged by him. What he's typing no longer appears in the body of the email, so he loses what he'd typed, sometimes a couple of sentences. For someone who is tentative about computers, it's pretty frustrating for him. (And me, by extension! ;-) Thanks for any help!