hello rahulramachandruni, '''follow the steps:''' '''Unmute Firefox and plugins''' * Open Firefox and play content that should play sound, such as this [[Firefox video]] or a Flash video with sound. * Click the volume icon in the Windows taskbar. * Click Open Volume Mixer. The Volume Mixer window will appear. * Make sure the sliders for Mozilla Firefox and [[Plugin Container for Firefox]] (for plugin content such as Adobe Flash) are not muted or at the bottom. <img src="https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/gallery/images/2018-06-17-20-46-56-141168.png"> ''' Check your audio device''' Make sure that the audio device (such as speakers or headphones) are turned on and connected to the computer properly. '''Other solutions''' Check out whether other applications on your computer can play sounds. If they can't: * Follow Microsoft's [[ Fix sound problems]] tutorial. * If Firefox is the only application that you can't hear sound in: * Try the solutions in[[ Fix common audio and video issues. ]] '''IMPORTANT:''' * RESTART BROWSER AND COMPUTER BOTH i hope resolved your problem then reply back to me on reply section. Thank you and Regards, ''Arman''