when using the browser firefox i often have difficulty deleting emails and have to close & restart the browser before i can, this seems to happen regardless whether i go to another site first or go to outllook first. i expect you may advise i use the app for email but i often use computers that are not my own to access emails & regardless much prefer using the browser. whether the fault lies with outlook or firefox i cant say. cant say i have noticed this issue with other browsers but obviously as i use firefox as my primary browser this is frustrating.