Hello, can you please try updating your Firefox to latest version that is Firefox 29. Update Firefox to the latest release

It can't help

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.

Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

• Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
• Under "Time range to clear", select "Everything".
• Now, click the arrow next to Details to toggle the Details list active.
• From the details list, check Cache and Cookies and uncheck everything else.
• Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

Try to disable hardware acceleration in Firefox (you need to close and restart Firefox).

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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

• disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
• disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
• disable hardware acceleration in the Flash plugin

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

I tried this but I still have the black blank screen, but it has improved for audio tumblr

Is only the Flash player missing or other elements as well?

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

still blank

Java probably doesn't have anything to do with this.

To avoid confusion:

• http://kb.mozillazine.org/JavaScript_is_not_Java

Did you try Firefox Safe Mode?

You can use one of these to start Firefox in Safe Mode:

• On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
• On Mac, hold down the Options key while starting Firefox
• Help > Restart with Add-ons Disabled

• https://support.mozilla.org/kb/Safe+Mode

I think it solved. youtube video problem has been completed because HTML5. but i have to request from http://www.youtube.com/html5. is there any other way, such an installed?

but.. its comeback again, audio tumblr can't playing. plugin slider doesn't show up on volume mixer :(

Are you using any extensions that can block content?

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

just idm cc, its update too

ooh, the trouble is in IDM, because IDM starts downloading audio automatically when I start playing it in a browser. now I can avoid it. the youtube video problem is fix because html5. can I installing Youtube all html5 on my add-ons?