HI Janette74, I understand that downloading and viewing youtube at the same time are contributing to a choppy video play back experience.

This may be due to resources or having many things open. Fix common audio and video issues may be helpful to fix common issues with video, however you can also check to make sure you are not using too many resources that may be affecting your playback.

not working, tried uninstall Firefox, reinstall, new adobe 16 reinstalled, not working, Comcast says Firefox issue

I understand that this has been marked as solved, however since this post, if others still have this issue please check to make sure your drivers are up to date .

no, it has not been solved, I never replied from last night, been out of my home. I would like to walk thru this with a phone call, these help items listed by youtube regarding a computer check does not work. Thank you

I've removed the solution since the issue is nor solved.

What did you try so far to solve this issue?

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can check for problems with current Shockwave Flash plugin versions and try this:

• check for updates for your graphics drive drivers
  https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration
• disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
• disable hardware acceleration in the Flash plugin

See also:

• http://kb.mozillazine.org/Flash#Troubleshooting

l am a rookie with all this, l do not understand