It DOES work in FF15 Rated 4 out of 5 stars

Thanks to GGITech's post "How to Get it Working" I undid all the changes that had already been made to about:config by me or other add-ons/options, and now NewTabURL is working beautifully again for me.

MANY thanks, GGITech!

Be good if the add-on author could update it to do the required tweaks for you though.

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