Mozilla Firefox Help

Sometimes, the video or audio content in a web page cannot be properly downloaded and displayed in Firefox. This article will help you solve these problems.  Fix Firefox Error Allow autoplay of media with sound Firefox may be blocking media with sound from playing automatically. To allow media autoplay, see Allow or block media autoplay in Firefox. HTML5 audio and video Firefox has built in support for open media formats usually associated with  MP3,  WebM, Ogg and Wave containers. However, MP4 containers usually depend on platform decoders for AAC and H.264 audio and video streams. For more information, see  Fix video and audio playback problems on Firefox for Windows and  HTML5 audio and video in Firefox. Clear the cache See How to clear the Firefox cache. Disable interfering extensions or ad-blocking software Ad-blocking software, such as anti-banner filters of your Internet Security program, or extensions, such as Flashblock or Adblo...

  When Firefox connects to a secure website (the URL begins with "http s ://"), it must verify that the  certificate  presented by the website is valid and that the encryption is strong enough to adequately protect your privacy. If it is unable to verify this, Firefox stops connecting to the site and will show you an error page with the message,  Warning: Potential Security Risk Ahead . What to do if you see these errors? If you see a  Warning: Potential Security Risk Ahead  message, you may: Contact the website owner and ask them to correct their certificate. Click  Go Back (Recommended) , or visit a different website. If you are on a corporate network or using antivirus software, reach out to the support teams for assistance. After viewing the error code and other information about the error, click the  Accept the Risk and Continue  button to load the site at your own risk. This will add a security exception for the website certificate. ...