Behodar: I think that this may be a core WebKit issue as I've been seeing the same behaviour in Safari recently (within the past month or two - since version 9, I think).
Could be. But also Windows Chrome does not use WebKit.
Edit: Also I think you will find this behaviour is by design.
I have this issue with one forum I visit - load multiple tabs and it only loads the page when you look at it I blame the crappy forum as it happens in both Chrome and Edge.
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