Recently some programs, such as Word, are opening behind the browser window, so the only way I can access them is by shrinking and moving the browser. I also find that when a program does open in front of the browser, (as did Excel just now, I am unable to pull the browser window back to the fore without shrinking or closing the app window - ie closing excel - as I did just now. I have tested this in Chrome and Edge, and they seem to behave just fine, so the problem would appear to be with Firefox settings, but I can't locate a setting to tackle this.