Windows 8 - Firefox 17.x and 18 don't play videos from CNET website

It played CNET videos before very good in last few months. And now Firefox 17.x don't play any videos from CNET. I updated FF to 18 version and it has same problem.

Hello tanphat99ct,
Thank you for posting here on the Mozilla Support Forums! We appreciate you as a user of Firefox!
Please make sure your plug-ins are up to date by following the instructions below;
Please check if all your plugins are up-to-date. To do this, go to the [http://mozilla.com/plugincheck Mozilla Plugin Check site].
Once you're there, the site will check if all your plugins have the latest versions.
If you see plugins in the list that have a yellow ''Update'' button or a red ''Update now'' button, please update these immediately.
To do so, please click each red or yellow button. Then you should see a site that allows you to download the latest version. Double-click the downloaded file to start the installation and follow the steps mentioned in the installation procedure.

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