Doesn’t matter whether you’re using Safari, Chrome, Firefox, or some other web browser: if you see a picture on a web page and you want a copy, just click and hold on it, wait a moment, then drag it off to your Desktop. Of course there are copyrights to think about but the mechanics of it are click, hold, drag, and let go. There are special cases where this will not work but most of the time, it will.
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