hello CatMax, for webgl you need a modern graphics driver. however from the system details you've submitted it appears that your device has an ATI Mobility Radeon X300 graphics card built in and this doesn't seem to be supported under windows 7 with updates any longer: http://www.microsoft.com/en-us/windows/compatibility/CompatCenter/ProductDetailsViewer?Name=AMD%20Mobility%20Radeon%20X300%20Graphics%20Card&vendor=AMD&Type=Hardware&tempOsid=Windows+7

so you might be out of luck of getting this site to work with your particular hardware unfortunately... Upgrade your graphics drivers to use hardware acceleration and WebGL

CatMax said

I need to view a plan in 360.autodesk.com Thanks !

Thank you Philipp ! So I believe my computer is to old... :-(

As you can see in the graphics section on the Help > Troubleshooting Information page, there are issues with your graphics display driver.

There are other things that need attention.

Your System Details list shows that you have a user.js file in the profile folder to initialize prefs each time Firefox starts. The user.js file is only present if you or other software has created this file and normally it wouldn't be there.

You can check its content with a plain text editor (right-click: "Open with"; do not double-click). The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.

You can delete the user.js file if you didn't create this file yourself.

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

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox