Thought the inevitable need to re-install Windows is here. But it turned out that Firefox was gobbling up lion’s share of processor power. Downloaded Google Chrome from https://www.google.com/chrome?hl=en&brand=CHMI and a bunch of problems has instantly disappeared. Also a rare case when something installed on the first attempt with no apparent load on my diminishing mental capacities. Recommended. Shared the story with famous Marisha of Chisinau and it turned out she went through the same experience and ended up with Chrome.