The "TimeInput_singleton" up and down arrows don't work in Firefox on Windows 10. Actually the down arrow does work if you try to find the right cursor position, but the up arrow seems to be impossible to click on. Also, as elsherbini has mentioned, clicking "Done" on every item, e.g. if you set your daily defaults, is slightly annoying and I lost all of my values the first time I put them in because I forgot to do so before switching pages.