Aside from all other advantages I'm on Firefox because can't live without MRU ctrl-tab tabs management. Chrome will never implement this, and plugins for different keys are not an option.
Air-water heat pump provides heating for our house (170 m2, Estonia, well insulated) all year round without engaging support electric heaters. In fact, breaker for support heater is always off. Temperature went to -22C previous winter for couple of days, heat pump was able to handle it. Average winter temperature is about -4C.