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Adblock
Just had new browser installed, and no Adblock yet.
Did now, and looked at flickr sgsin, and the ads are gone (which surprised me, as they were, as mentioned, "ad-images" that appeared between the user's images while browsing their stream). Cool.
Also, for tumblr, I found the add-on tumblr saviour - which has mixed revues (and I see no settings or button that should be there in FF), but it seems to kill the "sponsored" posts in my tumblr dashboard..
Adblock.