To reproduce, just take a brandnew portable 16beta2, with a brandnew profile. All native.
Open a couple KM pages in tabs, forum, wiki, whatever.
Now open adblock.css (Edit>Config>Ad-Blocking) and add the forum image from the left side:
img,
Toggle adblock off/on to import the updated css-file.
The image appears or vanishes on ALL pages at the moment of toggling adblock, they are n
Forum:
Development