"A ad blocker is preventing playback..."
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Some websites ask you to disable your ad blocker. 
The antivirus.
A VPN.
The host file.
Browser Cookies.
Box ISPs install an ad blocker.
Flush your DNS cache
Go to the options of the extensions or add-ons of the browser.
Disable the Adblock extension.
NoScript.
The NoScript extension filters JavaScript to display ads.
NoScript for Google Chrome and Edge
NoScript for Firefox
NoScript does not block ads on YouTube by default
Click the icon next to the address bar on NoScript or right-click on the page then click on the NoScript line.
Click on Options.
Click the ''Authorization by site'' tab
Copy/paste the problematic site in the '' Search or add a website '' box
Avast Online Security
Click the Avast Online Security icon next to the address bar.
Section “Ad Tracking”.
Click on Allow All.
Ideally, you should remove the extension.
Avira Antivirus.
The Web Avira extension that blocks ads.
Click the Web Avira icon next to the address bar.
Allow ads to open, scroll the wheel to “Block this website“.
Kaspersky.
Allow banners for this site.
Disable or remove your VPN.
Click on Restore.
Test in Private Browsing
With a keyboard shortcut for Firefox and Google Chrome: Ctrl+Shift+N
With Adblock, you need to disable it and then open a tab in private browsing.
Firefox Tracking.
Firefox’s tracking protection.
Firefox’s tracking protection can also block ads.
When Mozilla Firefox's tracking protection is active, a shield appears before the address.
By clicking on it, a “Disable protection for this site” button also allows you to permit the blocked content to display.
Go to mafreebox.freebox.fr
Log in with your credentials.
Settings section of the Freebox >Advanced Mode >Internet Connection > Configuration > Ad Blocking. Disable the option and click on the Modify button. To make the change effective, do not forget to restart the Box.
Type cmd
In the command prompt, copy/paste:
ipconfig /flushdns
Close the command prompt window or type exit.
Restart the PC.
- Possible and Potential Causes:
- The Extensions.
- The Antivirus.
- The VPNs.
- The host file.
- Browser Cookies.
- Box ISPs install an ad blocker.
- Flush your DNS cache
Possible and Potential Causes:
The Extensions.The antivirus.
A VPN.
The host file.
Browser Cookies.
Box ISPs install an ad blocker.
Flush your DNS cache
The Extensions.
Adblock and Ublock
Go to the options of the extensions or add-ons of the browser.
Disable the Adblock extension.
NoScript.
The NoScript extension filters JavaScript to display ads.
NoScript for Google Chrome and Edge
NoScript for Firefox
NoScript does not block ads on YouTube by default
Click the icon next to the address bar on NoScript or right-click on the page then click on the NoScript line.
Click on Options.
Click the ''Authorization by site'' tab
Copy/paste the problematic site in the '' Search or add a website '' box
The Antivirus.
Some antivirus software block ads by providing extensions.Avast Online Security
Click the Avast Online Security icon next to the address bar.
Section “Ad Tracking”.
Click on Allow All.
Ideally, you should remove the extension.
Avira Antivirus.
The Web Avira extension that blocks ads.
Click the Web Avira icon next to the address bar.
Allow ads to open, scroll the wheel to “Block this website“.
Kaspersky.
Allow banners for this site.
The VPNs.
A VPN can block ads.Disable or remove your VPN.
The host file.
Reset the host file with RstHOSTSClick on Restore.
Browser Cookies.
In the browser options under Privacy and Personal Data, allow third-party cookiesTest in Private Browsing
With a keyboard shortcut for Firefox and Google Chrome: Ctrl+Shift+N
With Adblock, you need to disable it and then open a tab in private browsing.
Firefox Tracking.
Firefox’s tracking protection.
Firefox’s tracking protection can also block ads.
When Mozilla Firefox's tracking protection is active, a shield appears before the address.
By clicking on it, a “Disable protection for this site” button also allows you to permit the blocked content to display.
Box ISPs install an ad blocker.
For example, with Free's Freebox Revolution V6 you can disable this ad filtering,Go to mafreebox.freebox.fr
Log in with your credentials.
Settings section of the Freebox >Advanced Mode >Internet Connection > Configuration > Ad Blocking. Disable the option and click on the Modify button. To make the change effective, do not forget to restart the Box.
Flush your DNS cache
Keyboard keys Windows + RType cmd
In the command prompt, copy/paste:
ipconfig /flushdns
Close the command prompt window or type exit.
Restart the PC.