Did the problem start while you still had Firefox 19?

Does Flash work normally on other sites?

Do embedded YouTube videos play, such as the one here: https://support.mozilla.org/en-US/kb/find-and-manage-downloaded-files

Are you enrolled in the HTML5 trial? http://www.youtube.com/html5

I assume you already tried the following, but just in case...

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove your google.com cookies (save any pending work first). While viewing a page on the site:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

Then try reloading the page and logging in again. Does that help?

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 or otherwise make changes.

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

Hi, thanks for the help. The embedded video link loads and plays just fine. I did clear the cache; I clear it frequently. I'll try again, using the advanced option, and also will try removing google cookies.

Hello, thanks, I tried safe mode yesterday, and also unchecked hardware acceleration. It didn't work.