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Get Firefox, a free web browser backed by Mozilla, a non-profit dedicated to internet health and privacy. Available now on Windows, Mac, Linux, Android and iOS.

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.

Table of Contents

Firefox may be blocking media with sound from playing automatically. To allow media autoplay, see Allow or block media autoplay in Firefox.

If you see a notification saying 'To play audio, you may need to install the required PulseAudio software', it means that Firefox cannot find or use PulseAudio. The PulseAudio software is required to play any audio from Firefox. Most Linux distributions now come with PulseAudio pre-installed.

Use your system's software package manager and ensure that PulseAudio is correctly installed.

Firefox has built in support for open media formats usually associated with MP3, WebM, Ogg and Wave containers. However, MP3 and MP4 containers usually depend on platform decoders for MP3, 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.

See How to clear the Firefox cache.

Ad-blocking software, such as anti-banner filters of your Internet Security program, or extensions, such as Flashblock or Adblock Plus, can prevent audio or video content from playing.

• If the site works with ad-blocking disabled, you may want to add the site to your whitelist in your adblocker filter.
• If the video or audio plays when you disable all extensions, then one of your extensions was causing the problem. For more information, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

• Cookies:

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ...
2. Select the Privacy & Security panel and go to the Cookies and Site Data section.
3. Verify that cookies are enabled and that the site is not blocked in the Exceptions list.

• History:

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ...
2. Select the Privacy & Security panel and go to the History section.
3. Make sure that Firefox is set to Remember history.

• Pop-up windows:

1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ...
2. Select the Privacy & Security panel and go to the Permissions section.
3. Allow the website as an exception to the 'Block pop-up windows' setting.

See Reset Firefox preferences to troubleshoot and fix problems.

If you use a hosts file, you can temporarily disable it by renaming it Xhosts. Or, you can edit the hosts file to remove specific entries such as ad.doubleclick.net that can cause videos on certain sites to fail (for more information, see this MozillaZine forum thread). To apply changes to your hosts file, you may need to flush the DNS cache by entering the command: ipconfig /flushdns in the Run dialog box on Windows.

Firefox Streaming Video

Based on information from Video or audio does not play (mozillaZine KB)

By Gina Barrow, Last updated: January 29, 2021

Is your Firefox not playing videos, even on any website you open and visit? Check out how to fix this problem in this new article!

Videos play a big role in search engines, websites, blogs, and more. They cater to a bigger form of communication today and even make a big impact on our every day surfing life. Apparently, videos are uploaded on websites and sometimes, we encounter viewing issues and hinder us from watching. What’s more? It’s so frustrating when you cannot open and play any videos you want to watch.

Firefox is among the browsers that users reported they were having problems playing the videos with. So today, we will give you several fixes that will resolve this issue. Find out!

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Solution 1. Allow Autoplay of media with sound

Unlike Chrome, Firefox, by default, blocks the automatic play of all media with sound. This might be one of the reasons why you cannot play videos on this browser. This change happened only after the latest Firefox update. The recent Firefox update made this change due to so many reports that websites with video autoplay when opened even when they are not necessary. Most of which are Ad videos which can be annoying to hear and watch. With the recent block, the videos will continue to play without sound.

Some users reported that after the update, they were not able to play any videos on YouTube, Facebook, and even on other websites. This is not a system glitch; in fact, it’s a new feature that you can simply customize according to your preferences. You can turn on the sound by clicking the Block Autoplay Control Center (the icon looks like a circle with a small letter i in the center) beside the URL bar. Click on the drop-down arrow in the Permissions section and choose between Allow and Block.

Another method to allow autoplay is to go to the Settings.

1. Go to Options by clicking the menu button or the three horizontal lines
2. Choose Privacy & Security
3. Scroll and select Permissions
4. Uncheck the box for ‘Block websites from automatically playing sound’

That’s it! Try playing some videos now to see if the problem is fixed!

Solution 2. Un-mute Firefox and Plug-ins

If you haven’t resolved the issue using the first solution, then maybe you have to change and customize some Firefox plug-ins. Another method to resolve ‘Firefox not playing videos’ is to verify that the plugin is not muted. If you have confirmed that there is no sound or the video doesn’t play, follow these steps:

1. Open the Volume Mixer
2. Check if the volume slider for Mozilla Firefox is muted, un-mute it. If it was set to low, move the slider up enough to hear sounds
3. Test if the issue is resolved

Solution 3. Disable Ad-Blocking Extensions

If you are using Flashblock or Adblock Plus, or any other ad-blocking software, they may interfere and prevent videos and audios from playing. Some internet security software also provides an included Ad-blocking feature.

Firefox Streaming Video Downloader

In order to fix this, you can try doing this step:

• Disable the ad-block extension or add Firefox to the whitelist of your adblocker extensions

Solution 4. Verify Firefox Cookies, History, Pop-up Windows Are Set

Firefox Streaming Audio Problem

Still, if you are unable to play videos on Firefox, you can check and verify some browser settings such as cookies, history, and pop-ups.

For Cookies:

• Go to Options from the menu bar
• Choose Cookies and Site Data under Privacy & Security
• From here, make sure that cookies are enabled. You also have to verify that Firefox is not blocked inside the Exceptions list

History:

• On the same setting, proceed to History
• Set Firefox in Remember History

Pop-Ups:

• Still, on the same setting, go to Permissions section
• Allow Firefox as an exception to “Block pop-up windows” part

Solution 5. Install Flash Plugin

Some websites like Microsoft Edge and Firefox need a flash player to view and stream multimedia contents. When a flash plugin is not enabled or embedded then you will not be able to play videos.

You can verify if the flash plugin is enabled in Add-ons Manager by:

• Clicking the menu buttonand then Add-ons
• Choose Plugins
• To enable the Flash plugin, click the ‘Never Activate’ and choose ‘Ask to Activate’ in the drop-down menu

When there is no displayed content and you see 'Run Adobe Flash Player' on Firefox, do the following:

• Click the Run Adobe Flash Playerin the address bar
• And click Allow

You can also select 'Remember this decision' so it won't keep on asking every time you want to watch a video.

Solution 6. Check Your Computer’s Audio Device

Apart from the Firefox settings, the issue may also be due to hardware problems. Often, it may not be the browser’s issue but the computer’s. Check if the audio device you are using (headphones and speakers) is turned on and properly connected. If you are using headphones, make sure that the cables are well connected to avoid any audio problems. Also, verify that the sounds are not muted on the volume control.

Solution 7. Update Firefox

If your issue is prior to the recent Firefox update, it might be caused by bugs and can only be fixed with a new update. This update is released by the developer itself and is available for users to download and install. Firefox like other browsers automatically downloads and installs updates when it’s available. Updates often fix any issues we experience while using the said browser.

However, if you would like to, you can manually update or check for updates on Firefox by going to the ‘About’ window and then clicking on the Help menu. Select 'About Firefox' to update.

There could be many possible reasons why Firefox cannot play videos. It may be due to some plug-ins, extensions, and updates. Fortunately, there are quick fixes to this kind of issue and anyone can actually do this without any expertise. Simply follow the solutions we recommended above and for sure, you will resolve it in no time! Have you experienced Firefox not playing videos? What have you done to fix it? Let us know in the comment section.