Ubuntu 16.04下Firefox无法播放Facebook视频及Twitch黑屏问题求助

Hey there, let's work through this Firefox video problem you're facing on Ubuntu 16.04. Since Chromium works perfectly, we can narrow this down to Firefox-specific media configurations or missing dependencies—let's jump into actionable fixes:

1. Install Required Multimedia Codecs #

Ubuntu 16.04's default Firefox setup might lack the necessary codecs for H.264 (the format most Facebook/Twitch videos rely on). Open your terminal and run these commands to install the full set of restricted extras and GStreamer plugins:

sudo apt-get update
sudo apt-get install ubuntu-restricted-extras gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly

Once installed, restart Firefox and test the videos again. This is the most common fix for missing video playback on older Ubuntu/Firefox combinations.

2. Reset Firefox's Configuration Profile #

Corrupted user settings can cause weird playback glitches even after reinstalling Firefox. Here's how to start fresh:

• Close Firefox completely (check the system tray to make sure it's not running in the background)
• Run this command in terminal to rename your old profile:

  mv ~/.mozilla/firefox ~/.mozilla/firefox_old
  

• Open Firefox again—it'll create a brand new, clean profile. Test Facebook and Twitch now. If this works, you can gradually migrate your bookmarks/settings from the old profile if needed.

3. Verify Flash Player Installation (and Enable It) #

Since you mentioned reinstalling Flash, let's make sure you have the correct version for Firefox (NPAPI, not the Chrome/Chromium PPAPI version):

• Run this command to install the official Flash plugin:

  sudo apt-get install flashplugin-installer
  

• Restart Firefox, then type about:plugins in the address bar. Look for "Shockwave Flash" and ensure it's set to "Always Activate".

4. Tweak Firefox MediaSource Settings (for Twitch Black Screen) #

Twitch relies on MediaSource Extensions to stream video, and sometimes this gets disabled accidentally:

• Type about:config in Firefox's address bar, accept the warning when prompted
• Search for media.mediasource.enabled and double-click it to set it to true
• Next, search for media.mediasource.mp4.enabled and also set that to true
• Restart Firefox and check Twitch again—this should fix the black screen while audio plays issue.

5. Disable Hardware Acceleration (as a Last Resort) #

Sometimes hardware acceleration conflicts with older graphics drivers on Ubuntu 16.04:

• Go to Firefox's settings (about:preferences#general)
• Scroll down to the "Performance" section
• Uncheck the box that says "Use hardware acceleration when available"
• Restart Firefox and test playback.

Start with step 1 first—it's the most likely fix for your issue. If that doesn't work, move through the other steps one by one.

内容的提问来源于stack exchange，提问作者zakaria hilali