hello arashqa, could you provide a sample of a site where this happens? in principle firefox does support mixed content blocking - however, by default it will only block "active" mixed content (that are scripts, stylesheets and other stuff that might get dangerous). another thing that might interfere is addons like adblock, noscript and others which are already blocking particular content that may cause the message... Mixed content blocking in Firefox https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/

It's a work site, basically the site was set up to use https:// and there were a few links which when I tried to click on them, they put http:// not https:// and that was causing problems in Chrome since Chrome expected the links having same protocol as the site but in Firefox it worked.

Note that you can leave out the protocol and leave the two starting forward slashes to use the same protocol as was used to open the page.

• //support.mozilla.org/en-US/questions/1033992

I think all browsers allow you to leave a secure page for an insecure page (from HTTPS link to HTTP link) without a warning, otherwise you would go crazy using Google and other search engines that use HTTPS. There is an exception for when a form is being submitted from a secure page to an insecure page: then you definitely should get a warning that your submission isn't being encrypted.

What Firefox and other browsers now pay closer attention to is content pulled into the page, treating some as high risk (such as scripts) and some as low risk (such as JPEG images). You can adjust Firefox's settings to block this lower risk "display" content if you like. (It requires switching the security.mixed_content.block_display_content preference from false to true in the about:config preferences editor.)