h2obury26 said

When I play a video, I get no sound. If I play the video with Google Chrome, I get both. I am sure it is a plug in problem. I reloaded Adobe Flash. When I did a plugin check, I was told that Shckwave Flash was up to date.

Crashes or other problems with certain multimedia content in Firefox (such as YouTube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles:

• Flash Plugin - Keep it up to date and troubleshoot problems

• Adobe Flash plugin has crashed - Prevent it from happening again

Please tell us if this helped!

Is there a Flash player being used or the HTML5 media player that YouTube might be using by default in Firefox 35? You can check that via the right-click context menu in the player area.

This extension allows to switch between the Flash player and the HTML5 media player on the YouTube website. YouTube Flash Video Player:

• https://addons.mozilla.org/firefox/addon/youtube-flash-video-player/