>>1403387Nothing, really. You can deactivate it.
But 4chan has remained one of the sites without heavy use of JavaScript and AJAX (while still being useable), which was kinda nice. Also, I suspect that one of the main reasons for moot to include the official extension into the vanilla 4chan experience was him losing money with the site - by loading new posts via the API using AJAX saves massive amounts of bandwidth compared to reloading the whole page, which every newfriend of casual user who doesn't see the settings link will do now (few of those would've installed the extension). And I don't think changing features to accommodate the explosion of traffic in the past months and years is neccessarily a good thing.
(I still don't get why moot doesn't display the J-List ad on anime-related NSFW boards. J-List is pretty NSFW anyway, and, for example, the average /p/hotographer won't visit that site anyway, while someone who likes /h/entai or /e/cchi would be very much interested in J-List's products.)
Then again, I'm not moot or the average 4channer, so I don't really know the full background of this change or how the average user sees it after a few weeks (right now, everyone calls moot a faggot, which he certainly expected).
The smaller features which are new to 4channers who hadn't used the extension before are nice, though.