It looks like it's been around half a years¹. There's also a reference to the Chromium bug² for implementing the same there. There's also mixed content blockin

It looks like it's been around half a years¹. There's also a reference to the Chromium bug² for implementing the same there. There's also mixed content blocking³ which is a similar but user facing feature. 1: https://bugzilla.mozilla.org/show_bug.cgi?id=762593 https://bugzilla.mozilla.org/show_bug.cgi?id=762593 2: https://code.google.com/p/chromium/issues/detail?id=327032 https://code.google.com/p/chromium/issues/detail?id=327032 3: https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/ https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-bloc...