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Probably a crab spider Misumena vatia (NL: gewone kameleonspin D: veränderliche Krabbenspinne). They vary in colour quite a lot. Usually they are sitting on a blossom of similar colour and wait for prey.
No, this one is actually looks green.
I think I already found it, it's about 3.5mm long, bright green abdomen with green legs and a brown head, it looks like a Green Meshspider(Nigma Walckenaeri). I just wasn't sure because most descriptions of this have more yellow-ish legs, these are green all the way until the legs are too thin to really show visible color.
For the one I proposed, yellowish green is also possible. The one in your link seems to have a hairy abdomen, which I don't see in your picture. Also it seems to be much darker greenly coloured. (Just my two cents, but I'm no expert)
General shape (crab spiders have prominently larger front legs) doesn't check out.