PopUp for Send a link inemail

I searched google with this in the search bar: " HP desktop running windows 10 using Mozilla Firefox and can't disable pop up after I click on File and click onemail link using Firefox browser. I was unable to find the BLOCK POPUPS under privacy and secyrity and I tried 3 of the other suggestions google gaveme with the search therm listed above e and I can't seem to disable or block the popup after clicking on File, thenclick on email link in your browser. What happens is: A bluish envelope pops up and makes a sound like it is sending the email link and then the envelope disappeaars. I don't know where it issending the link. Please try the search term I used in Google and listed above and see if you can figure out a better step by step way to get rid of that POPUP, or block it, or delete itentirely. I jjust want the old and very convenient esult I had before the update and it was soeasy to email limk and I would type in the address with a shortmessage of why I'm sendingthat link: usually to afamily member or afriend. Thank you for any help/advice you can offer.