Total online retail spending in November and December across desktops, smartphones and tablets will reach $61 billion, representing a 16 percent gain over last year, according to the ComScore 2014 holiday season forecast.

Spending using desktop computers for that period is expected to reach $53.2 billion, up 14 percent year-over-year, and 4 points higher than last season's 10 percent growth rate.

Meanwhile, mobile commerce is predicted to account for $7.9 billion in retail spending, representing 13 percent of total digital commerce and growing 25 percent from last season.

"Although some lasting effects of the Great Recession still provide some overhang on the economy, many of the latest indicators point toward signs of optimism for consumer spending during the holidays," says Gian Fulgoni, executive chairman emeritus, ComScore. "Negative economic sentiment is at a 5-year low, the stock market is near all-time highs and inflation has been kept in check. The one negative is that real wages for many middle-class Americans have not grown and in fact may have declined slightly. That said, the recent trends we've seen in online consumer spending suggest that American consumers are ready to open their wallets and embrace the spirit of giving this holiday season."