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I want to change the reminder sound. I already downloaded a MP3 file and I selected it on "Reminders", "Use the following sound file". I can see the window that pops up, but no sound is played. Also when I click on Play, it doesn't work. I know the sound file is fine, thus I can play it on my laptop. What should I do? Another question, is there any Add-on with Reminder sounds?

Thanks in advance.

At one time, I was able to swipe left on my trackpad and go back to the previous page on firefox. I can't seem to find where to set that preference. I'm running MacOS.