Skip to content

Fix: Firefox Not Playing Online Videos on a Computer

Do you face an issue with the Firefox browser not playing videos? Learn how to fix video playback issues with our troubleshooting guide.

Firefox browser might not play online videos due to unknown problems or incorrect settings within your browser.

We can resolve this problem using various troubleshooting methods, such as refreshing the browser, turning off the extensions, and clearing the cache files.

In this guide, we have shared the troubleshooting steps for fixing the issue with the Firefox browser not playing the online media player.

Before you begin with advanced methods, you can start with basic browser troubleshooting, which can help fix temporary issues.

Method 1: Update the Browser App to the Latest Version

There might be a chance of having the older version of the browser app, which the video player doesn’t support. Hence, the latest version might include the support.

  1. Launch the Firefox browser on the computer.
  2. Click on More horizontal 3-bar icon for the options menu.Firefox Browser Options Menu
  3. Select the Help > About Firefox option.
    About Firefox Help SectionThe About Mozilla Firefox window will appear, and start checking for updates.

Firefox will download the updates and automatically install them in the background.

Firefox Quantum is up to date

After updating, you will save your data and passwords. Instead, you will have the new features that have been recently added.

Method 2: Clear Browser Cookies and Cache

Sometimes, temporarily stored data collected in cookies and cache could prevent videos from being played. The browser tries to load outdated information from the browser storage instead of real-time data. Hence, clearing these data can help in retrieving the latest data.

  1. Open the Firefox browser on your computer.
  2. Click on the More horizontal 3bar icon menu and select the Settings menu.
    Settings menu in Firefox for Computer
  3. Switch to the Privacy & Security tab and scroll to the Cookies and Site data section.
    Cookies and Site Data section in Firefox Computer under Privacy and Security settings
  4. Click on the Clear Data... button.
  5. Enable the checkbox for the 'Cookies and Site Data' and 'Cached Web Content' options.
    Cookies and Cache Clear Data window in Firefox computer
  6. Hit on the Clear option.
    It will immediately delete the cache, cookies, and site data on the browser.

Clearing the cache will also free up some space to help load and play the videos. However, this will also log you out of any sign-in you might have in the browser.

Method 3: Disable Add-ons and Extensions

Add-ons can sometimes conflict with browser functionality and block essential resources that help play the video. Try turning off all extensions individually and check if the video plays.

  1. Open the Firefox app on the computer.
  2. Click on More horizontal 3-bar icon for the options menu.
  3. Select the Add-ons and Theme options from the list.
    Add-ons and Themes option in Firefox Computer browser
  4. Switch to the Extensions from the left sidebar.
  5. Toggle the Disable option of every extension.
    Toggle Button to disable the Firefox Add-on

You can either turn off all the extensions or enable them individually to check which is causing the problem. If you find any culprit, replace it with an alternative or permanently delete it from the browser app.

Method 4: Enable Media Autoplay Settings

Firefox blocks videos with sound from playing automatically by default. Enable the media autoplay option to check if this setting is causing the problem.

  1. Launch the Firefox browser on the computer.
  2. Click on More horizontal 3-bar icon for the options menu.
  3. Choose the Options tab from the list.How to block sound acess in Firefox computer
  4. Switch to the Privacy & Security tab and scroll to the Permissions section.
  5. Click on the Settings… available next to the Autoplay. 
    How to allow sound access in firefox computer
  6. From the default for all websites dropdown, choose to Allow Audio and Video.
  7. Click the Save Changes command button.
    How to allow sound access in Firefox computer

When you enable autoplay, the videos on the browser screen will be played automatically without any actions or clicks. This consumes a bit more data in the background and can sometimes be annoying.

Method 5: Reset Firefox browser to Default Settings

If anything mentioned above fails to solve the issue, you can completely refresh or reset the Firefox settings. Follow these steps:

  1. Launch the Firefox browser on the computer.
  2. Click on the More horizontal 3-bar icon for the options menu, and select the Help menu.
    Firefox Help option menuIt will expand the Help menu.
  3. Click on More troubleshooting information from the sub-menu.
    Mozilla Firefox More Troubleshooting Information menu under Firefox Help
  4. Select on the Refresh Firefox… button.
    Refresh Firefox button to reset browser
  5. Hit on the Refresh Firefox in the confirmation dialog box.
    Refresh Firefox to Remove Customization and Settings

The refresh or reset will remove all customizations and settings to make Firefox as fresh as new. However, saved data, like bookmarks and passwords, will stay intact.

Bottom Line

The online video player needs the help of JavaScript execution settings and a browser rendering engine to load and support the playing. You can check the browser settings first if the video is not playing.

Most users have reported that clearing the cache data has helped them play the videos.

Please share the article if you find it helpful:

Disclosure: This page may contain affiliate links, which means we may receive compensation for your purchases; of course at no extra cost to you (indeed, you may get special discounts).
Kushal Azza

Kushal Azza

Kushal Azza is a Google Certified IT Professional, Digital Content Creator, and Go-To Digital Marketer with Engineering Degree. He has over a decade of experience solving tech problems, troubleshooting, and innovating digital solutions. Follow him on Twitter and LinkedIn.

Leave a thought or feedback

Please leave a descriptive comment or feedback with your real name. Our human moderator vets every comment, and it may take 24 to 48 hours to get published or rejected.

Your email address will not be published, and we will never spam your inbox. Required fields are marked *