They’ll probably just think the site is broken, but it’s really their content blocker. Lots of sites will be missing content, have broken links or customers won’t be able to add certain items to their shopping carts. “First, the experience for customers will be lessened. “This upcoming holiday season… content-blockers are going to cause a lot of problems,” Mason says. The issue was first brought to our attention by Chris Mason, CEO of Branding Brand, a Pittsburgh-based company whose platform powers mobile commerce sites and apps. A Fortune investigation shows that an iPhone enabled with Crystal - the top paid iOS app right now – is unable to fully render the e-commerce sites of many major retailers, including Walmart, Sears and Lululemon.