Since the last update of firefox (version 38.0) I can't play videos. Could not find the cause.

It seems to be random. Sometimes I can play a video on some website, but youtube no longer works, as well as videos from facebook. They work fine in Internet Explorer. However, I like Foxfire. I don't want to go back to IE.

YouTube is generally serving Firefox users an HTML5 player now instead of the classic flashplayer. There may be a problem in your Firefox or your Windows Media Player MP4 without Flash.

First of all, you can check which player does not work by double-clicking on the player and inspect the bottom of the context menu line short. Who will usually mention the specific plugin if a plugin is used, for example, Flash or QuickTime. If not, most likely, it is an HTML5 player.

Firefox can read WEBM and OGG video natively without outside help, but uses Windows Media Foundation to play the MP4 video. There are some settings in Firefox to disable it; users who download MP3s sometimes easily changed these settings. Here's how you can check your:

(1) in a new tab, type or paste Subject: config in the address bar and press ENTER. Click on the button promising to be careful.

(2) in the search above the list box, type or paste the media and make a pause so that the list is filtered

(3) {for Windows newer than XP} if the preference media.windows - media - foundation.enabled is in bold and user set to 'false', double-click to go to true

(4) {for Windows XP} If media.directshow.enabled preference is in bold and user set to 'false', double-click to go to true

If you have changed these settings, does make a difference? I'm not sure if the change takes effect immediately or after leaving Firefox and start it again.

Users in Europe need the Feature Windows Media Pack, but if your Windows comes with Windows Media Player, then that probably does not apply to you. See:

If this is not resolved quickly, there is a quick and dirty solution for YouTube, which is to use an add-on to force YouTube to give you the Flash Player instead: https://addons.mozilla.org/firefox/addon/youtube-flash-video-player/

Tags: Firefox

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