Revokes video permissions for any non-UK flag within /brit/ :

4chan.org##.postContainer.replyContainer:not(:has(.flag-gb)):if(.fileText:has-text(/webm|mp4/)):if(:upward(2).subject:has-text(brit))

>>211684607
[Settings] > Miscellaneous > Custom CSS (tick box) > [Edit] > Paste the following:

.middlead.center {
display: none;
}

.danbo-slot {
display: none !important;
}

Save CSS > Save Settings

(works on mobile too)