You can try basic steps like these in case of issues with web pages:

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

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

thanks, but it didnt help

Do you see any error messages?

Are there any errors visible in the Browser/Error Console (Firefox/Tools > Web Developer;Ctrl+Shift+J) about these missing Flash movies?

• https://developer.mozilla.org/en/Tools/Web_Console

You can reload the page via Ctrl+F5 to refresh all content.

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

Метка времени: 06.09.2013 16:59:06 Ошибка: this.docShell is null Источник: chrome://global/content/bindings/browser.xml Строка: 323

this._webNavigation = this.isRemoteBrowser ? this._remoteWebNavigation : this.docShell.QueryInterface(Components.interfaces.nsIWebNavigation)

Only 1 error