But please, make it open source or announce your monetization plans. Freeware extensions tend to be acquired by the worst companies or bundle malware eventually. If you say you have no plans and intend to keep your word, I shall make an open-source version myself.
But don't let this rant detract from the main point: I love this a lot. If it were somehow synced with Firefox sync, I'd gladly throw even more money (donation, one time purchase) your way.
Also, no monetization plans yet, but if they come, I'll make sure they're not breaking the original promise of privacy and simplicity.
Firefox sync would be nice, although I would make it optional.
Could I set something up where I can edit it both in the browser and my editor or something?
Also a firefox add-on would be cool as well.
There is a Firefox add-on, if you visit the site from Firefox, it should point you to the Mozilla Add-ons page [0].
[0] https://addons.mozilla.org/en-US/firefox/addon/nutab-new-tab...
Also thank you for the link to the firefox add-on.
If you were so inclined, you could look into setting up some storage integrations with things like owncloud or dropbox. I believe they offer APIs that allow you to store files without having to write a server-side integration with them.