For years Firefox has been my preferred browser. When I open a new tab I like to have it open to a custom page on my local drive rather than the standard Firefox new tab page. I was able to configure this using the “browser.newtab.url” setting available in the “about:config” page.
As of today, with the release of Firefox version 41, for security reasons this setting is no longer supported. Fortunately there is a New Tab Override add-on that can be installed to provide the same facility.