The Firefox icon on my task bar has changed to a generic.
When I first downloaded Firefox, I put it on the task bar and it showed as the Firefox icon. After installing Microsoft Office, it changed to a generic file icon. I reinstalled Firefox and got the icon back. Some time later it changed again, but I did not notice until it had already happened so I don't know what might have done it. It has the correct icon when Firefox is open, but has a generic file icon otherwise.
When I first downloaded Firefox, I put it on the task bar and it showed as the Firefox icon. After installing Microsoft Office, it changed to a generic file icon. I reinstalled Firefox and got the icon back. Some time later it changed again, but I did not notice until it had already happened so I don't know what might have done it. It has the correct icon when Firefox is open, but has a generic file icon otherwise.
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You can try to reset the Windows icon cache.
- Open the Task Manager (Shift+Ctrl+ESC)
- In the Process tab, right-click on the Explorer.exe process and select End Process.
- Open the file picker via "File > New Task (Run)" and click the Browse button.
- Type or Paste %USERPROFILE%\AppData\Local in the File name field (AppData is a hidden folder).
- Select the file IconCache.db and use Delete in the right-click context menu to delete the file.
- After the IconCache.db has been deleted, start a new explorer.exe process via "File > New Task" to get the desktop and Taskbar back.
- It is possible that the file IconCache.db is a hidden file and in that case you need to enable viewing hidden files. You can verify that you can see the file before doing the above mentioned steps.
See http://kb.mozillazine.org/Show_hidden_files_and_folders