You can check for issues with the Windows icon cache.

Try to rebuild the icon cache (IconCache.db).

1. Open the Task Manager (Shift+Ctrl+ESC)
2. In the Process tab, right-click on the Explorer.exe process and select End Process.
3. Open the file picker via "File > New Task (Run)" and click the Browse button.
4. Type or Paste %USERPROFILE%\AppData\Local (%LocalAppData%) in the File name field (AppData is a hidden folder).
5. Select the IconCache.db file and use "Delete" in the right-click context menu to delete the file.
6. After the IconCache.db file has been deleted, start a new explorer.exe process via "File > New Task" to get the desktop and Taskbar back.

The IconCache.db file is a hidden file, so make sure that you can see hidden files.

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

• http://www.thewindowsclub.com/rebuild-the-icon-cache-windows

had to redo all 29 icons for web short cuts!! will never refresh firefox again , to much work to do after with desktop web shortcuts, (icons)

Windows can change icons if it detects a change in the default browser. We have some quite a few reports with desktop icons in particular on Windows 7.

Icons change incorrectly in Windows: https://support.microsoft.com/en-us/kb/2396571

that didn't work either. As I said had to redo all 29 icons for web short cuts!! will never refresh firefox again , to much work to do after with desktop web shortcuts, (icons)