Firefox 42+ has a Tracking Protection feature that is enabled by default in Private Browsing mode. When you are in private browsing mode then Firefox can show a shield icon at the left end of the location/address bar that some content is affected.

You can disable this feature in "Options/Preferences > Privacy" or via the about:privatebrowsing page that get when you open a New Private Window.

• Options/Preferences > Privacy: "Use Tracking Protection in Private Windows"

• https://support.mozilla.org/kb/tracking-protection-firefox
• https://support.mozilla.org/kb/control-center-site-privacy-and-security-firefox

If you use extensions (3-bar Menu button/Tools > Add-ons > Extensions) that can interfere with loading content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions do not interfere with loading content. There is security software that can interfere with loading content, so check that as well.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I do not use Private Browsing Mode. I have got Adblock Plus but switching it off doesn't help. It must be something else.

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required) where this happens?

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

• Use a compressed image type like PNG or JPG to save the screenshot
• Make sure that you do not exceed the maximum size of 1 MB

I'm sorry, I didn't notice that my screenshots hasn't been attached in my first post.

http://joemonster.org/filmy/74586/Apropo_Defacto_Wielki_test_ostrych_sosow http://www.sadistic.pl/trening-bramkarza-vt400250.htm http://allegro.pl/xperia-z3-compact-etui-oryginalne-x-shape-szklo-i5276757120.html?bi_s=ads&bi_m=p2,1&bi_c=81455

Can you tell what elements are missing or otherwise affected as the screenshots seem to look the same for me apart from the missing player in the first screenshot.

The second screenshot shows content that I'm not seeing as there is not much content on the page you linked.

The third screenshot doesn't look different at first sight.

In the first screenshot player is missing. In second should be 3 players. In third one auction is displayed for like 1 sec and then disappears but I noticed that in this case Internet Explorer is not working too.