If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content. *make sure your extensions and filters are updated to the latest version *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems Firefox shows an highlighted shield icon at the left end of the location/address bar in case Tracking Protection is blocking content. *click the shield icon for more details and possibly disable the protection You can check the Web Console what content is blocked. *"3-bar" menu button or Tools -> Web Developer *https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop