I lost my Outlook365 with the latest Windows 10 update. When I reinstalled I went through the preferences to select Firefox as my default browser. I have been using this for years and every time I picked a link in an Email it would open a new tab in my existing browser. Now, regardless of anything I try it continues to open an new Firefox browser, with pages included since this started on the weekend. What settings am I needing to make to correct this. I have gone through the config settings and selected 0 in the browser.link.open_newwindow.restriction with no success.