Don't know if it is coincidence or causality but when I installed Opera because of some things I had there in other distros, Iceweasel can no longer work. Everytime I try to bring up Iceweasel, i get an error with no error message. I thought maybe it was an internet problem but Icedove worked fine. Opera also works fine and when I click on an item in an email, it shows up on Opera. This started as soon as I installed Opera. I did nothing to mark Opera as being the preferred browser and when I click on the web browser in the tray it tries to bring up Iceweasel. Very confusing. All I want is the ability to use both iceweasel for some things and Opera for other things.