Comparing the number of CVEs is not a good way to compare how vulnerable different browsers are. For instance, I believe that Firefox and maybe Chrome bucket together multiple internally reported vulnerabilities into a single CVE.
Re:Ask HN: Firefox vs. Chrome security
by lawnchair_larry on Wednesday November 15, 2017 @12:17PM
(#15705438)
Don't do this, it's an anti-metric. Unless you think Opera and Konqueror are the most secure browsers.
Update Maybe this:
http://www.cvedetails.com/product/15031/Google-Chrome.html?v...
http://www.cvedetails.com/product/9900/Microsoft-Internet-Ex...