1/1/16: Happy New Year! Updated the extension to 1.1.6! Fixed the options page, apparently it was just plain missing for two and a half months.
Introducing the unofficial (of course) NG Mature Thumbnail Filter Google Chrome Extension: https://chrome.google.com/webstore/detail/newgrounds-ma-filter/phchlhgfejopgcopjdndleaohemaddim
What is it?
This Chrome Extension filters M and A rated thumbnails from view according to your specifications. You can choose which ratings to filter and which pages to filter them on. Any flagged thumbnails will be replaced with the NG M or A icons.
What it is NOT?
The extension does not BLOCK any content. You can still get to all content by clicking the filtered thumbnails.
Perhaps the biggest problem I've always had with NG is the ease with which M and A thumbnails are shown on the website - even the main page in the case of M rated stuff. This problem was remedied a tiny bit with the redesign a couple years ago (at least it seemed to me), but it's still a problem, and there's no account options to get around it presently as far as I'm aware of. So I looked at this as a good opportunity to mess around with Chrome extensions. I made this fully aware that many would not require or want such a thing, and maybe I'd be the only one to ever seriously use it. But maybe this would make taking a quick peek at NG during work safer for some of you, I dunno :)
So what all does it do?
Here's a full list as of now:
Can filter thumbnails from M and A rated content site-wide (and if there's a page that isn't covered, it's an error and I should probably know about it). Additionally, you can choose to filter thumbnails based on content type (Art, Movies, Games) or rating (M or A) via an extension icon in the omni-bar or whatever Google calls it.
Places a warning on playlist pages that there is currently no way to tell what playlist content is rated from that page and you should proceed with caution.
Remember that all NG content is user-rated, and this means that the extension is not going to be effective if somebody submits a mature thumbnail for a E or T rated entry.
Also due to the nature of the extension, all blocking occurs after the page is fully loaded. If you have a slow connection, the blocking may not be instantaneous once you go to a page.
Lastly, since this extension relies on the website being exactly how it is right now, any changes that the staff make may break the extension. But I don't expect any serious changes like that until another redesign.