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Of the 1 million most popular Internet sites on the Internet, 35,000 still use a Symantec certificate to provide a secure connection to visitors. In October, Firefox users will be notified by visiting these sites that it is not safe.
Mozilla then says trust in these Symantec certificates. Due to various incidents with Symantec issued tl certificates, browser developers have decided to cancel the Symantec certificates approval. This is done in phases, with all Symantec certificates issued before July 1, 2016 being more reliable. That's already the case in Chrome, Firefox and Safari.
With the release of Firefox 63 in October this year, trust in all Symantec certificates will be canceled regardless of the release date. Users will soon see a certificate warning when visiting these websites. Mozilla decided to study the extent of the impact of this measure. Of the 1 million most popular websites on the Internet, 3.5% still used a Symantec certificate.
However, Mozilla expects the number to decline sharply in the coming period. For example, in March, 10,000 websites used Symantec certificates issued before July 1, 2016. With the launch of Firefox 60 in May, which no longer relies on these certificates and displays a warning, the number of websites dropped at 1500. A similar scenario is anticipated in the perspective of Firefox 63.
Users who receive a certificate warning have the option to ignore them, but this is strongly discouraged, as it may mean that someone is leading a man-in-the-middle attack, for example. Mozilla advises webmasters with Symantec certificates to replace them immediately so users do not get bothered.
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