That notice is big and annoying.

A button for future stuff like that saying "OK, I now know this, there's no need for this to still show up" would be perfect.

Actually I had a better idea. There is an option I just toggled for that notice that'll make it non-persistent - that is, it'll show up once when you initially visit the forum then it'll disappear until you visit again, it shows up once per browser session.