1) Please check your proxy settings:

At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click Options Select the Advanced panel. Select the Network tab. In the Connection section, click Settings.... Change your proxy settings:

   If you don't connect to the Internet through a proxy (or don't know whether you connect through a proxy), select No Proxy.
   If you connect to the Internet through a proxy, compare Firefox's settings to another browser's (such as Internet Explorer — see Microsoft's guide to proxy settings http://windows.microsoft.com/en-US/wi.../Change-proxy-server-settings-in-Internet-Explorer). 

Close the Connection Settings window. Click OK to close the Options window

2) Problem caused by cache, cookies, please clean your cache, cookies.

3) malware issue, scan your computer with anti-malware program, such as Anvi Smart Defender, maywarebytes.

This was filed with Android system details so it may very well be another 'all I see is white content' issue.

To m9ri99s, which device are you using?

Motorola Atrix2, Lithium Rom

I can reproduce this by setting 'Don't keep activities' in Android Settings > Developer Options. Do you have this checked? This setting is only available on Android 4.0 (Ice Cream Sandwich).

Uninstalled. Will try again later.