Some retailers launched online deals well in advance of Thanksgiving, Black Friday and Cyber Monday.
The retailers led in Internet Explorer and Firefox availability tests, respectively, last month.
Amway.com had the best availability score for Internet Explorer testing among large retailers tested in June, says Compuware Gomez. Last month, the retailer posted 99.99% Internet Explorer availability. Newegg.com topped the Firefox availability rankings at 99.98%.
Gap.com (99.96%) finished second in Internet Explorer tests and Newegg.com (99.95%) came in third. HSN.com and Overstock.com (99.93%) tied in fourth place.
In Firefox testing, Dell.com (99.93% availability) followed Newegg.com. Four retailers (Amway.com, CDW.com, Gap.com, and QVC.com) tied in third place with an availability score of 99.92%.
The average Internet Explorer availability score among the 22 retailers measured in June was 99.47%. The same group of retailers produced an average Firefox score of 99.55%.
Click here for the full test results.