If you like the new tab to open a URL like google.com for example (as I do) this is the fix for Firefox 41 as Mozilla seems to like to send us to their new tab interface that is nothing more than useless and to send you ads.
The old about:config fix "browser.newtab.url" does not work anymore they disabled the feature..
Fix below..
http://www.ghacks.net/2015/06/28/mozilla-removes-option-to-change-new-tab-page-from-firefox/
New Tab Override (browser.newtab.url replacement) 1.0
https://addons.mozilla.org/en-US/firefox/addon/new-tab-override/
The old about:config fix "browser.newtab.url" does not work anymore they disabled the feature..

Fix below..
http://www.ghacks.net/2015/06/28/mozilla-removes-option-to-change-new-tab-page-from-firefox/
New Tab Override (browser.newtab.url replacement) 1.0
https://addons.mozilla.org/en-US/firefox/addon/new-tab-override/
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