Tweets posted in other web sites are partially visible. The heading and text are typically visible, but not the graphics. Any ideas?
Possibly related: with sites using Facebook for comments, None of the comment section is visible. If I was not aware they used FB already, it would appear that comments weren't supported. See attached for tweet example.
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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"