I have Microsoft Editor temporarily disabled on reddit.com, but the "Spelling correction: Open with the left-click (Alt+Down Arrow)" dialog keeps popping up anyway. What's worse, there's no way to click out of the popup when there's no error on the screen if there are no misspelled words on the page (perhaps Editor prematurely flagged a word you were still typing or you corrected it yourself manually). To close this popup, you have to intentionally create a misspelled word and use Editor to correct it.