Counting patched vulnerabilities is meaningless when it comes to assessing security- as the report actually points out.
ZDNet is all about sensational journalism- no wonder they didn’t put the graphic up without this caveat- and any claim that “Firefox is less secure” or “IE is more secure” is of course lapped up by people with an ideological axe to grind.
Go and read the actual report your story links to for the full facts.