Mozilla, the developers of the popular browser Firefox, has announced something that contradicts its previously plans.

The browser maker had announced in October 2015, that it was going to phase-out SHA-1 certificates in the coming year.

And with the release of Firefox 43, which was rolled out in December, it put its plans into action. The browser began to reject websites, which used SHA-1 certificates, which were issued after December 31st 2015.

Well, this has proven to be a disastrous result. Apparently, some users who updated to the latest version of Firefox, were unable to access HTTPS sites, which were still using the vulnerable certificate [...]