Firefox 23 added a new feature that automatically blocks mixed content. Mixed content comes into play when browsing secure websites. (i.e. websites with “https”), when the webpage doesn’t serve everything on the https protocol but serves some images on http.
Normally, this isn’t really the big issue. However, if you are concerned about security and especially tracking, then you might want to prevent this happening. Firefox understands that and automatically blocks mixed content. When browsing a secure website displaying mixed content, you might view something like this: “Firefox has blocked content that isn’t secure”.
As you note in the URL, browsing WordPress.org is likely to throw up this warning. This is because Firefox automatically blocks all active content like scripts that aren’t also served on the https protocol.
Hitting “Disable Protection on This Page” will fix it for the particular page. However, it won’t respect this on other sites. If you’re like me, this isn’t a helpful feature but rather a pain! And, you’ll want to disable this.
Here’s how you do it.