Just a heads up that this site has an animated SVG favicon. I had added it to my Firefox bookmarks bar and the favicon kept animating its color changes. Looked pretty neat, but then realised after a day or so that Firefox was chewing up 50-60% CPU on my MacBook Air. Turns out it was down to this bookmark, after I removed it, the CPU levels were much much lower.
I'm not sure if it's the same deal if I were to put the bookmark in a folder (so it's not in view all the time) but just something to note.
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