Google basically bought Foxit's library and open sourced it - but looks like the open source version isn't keeping up with the upstream commercial version of Foxit because the latest Foxit reader doesn't seem to have this bug.
Hopefully Web Assembly will change this.
In practice what really prevents it from being viable in my experience is print quality. Since it uses canvas to render the PDF and their print solution just prints the canvas images, they dpi is low and the output is noticeably "fuzzy". PDF being primarily for print this really kills it. You have to save as PDF and print using Acrobat to get good quality.
If they ever get their SVG back end working it should solve the print issue, honestly they probably should have started with a SVG back end, this same issue plagues many canvas based libraries.
Interestingly they tried to do a canvas based print api (mozPrintCallback) that went nowhere. IMO browsers need better print abilities (see PrinceXML). But at least SVG is rendered to vector on print in all major browsers.