I recently updated my Firefox to 4.0. And now, when I type in url's into the location bar, I can no longer press enter on my keyboard to launch the website. I have to go up to the green arrow to make it go to the webpage. But when I launch firefox in safe mode, without any of the add-ons enabled, it works. I've tried disabling all the add-ons while normally using firefox but it doesn't work still. I've even uninstalled, and re-installed firefox to see if it would help but it still doesn't work.