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Can I change the Firefox icon permanently?

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I've been trying to change the Firefox/Nightly icons to a custom icon that will show in the taskbar. I've tried using resource hacker to fix it, but after I restart my computer or wait long enough the changes will disappear and the icons will go back to normal.

The icon for the firefox.exe in the programs will change to the icons I want once I use resource hacker, but when I turn my computer back on they go back to the default ones. Is there a way to change the icon "permanently" and still be able to change it back when I want it back?


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You can see in the first screenshot the firefox.exe and firefox_original.exe. I am trying to make Nightly's firefox.exe look like the Firefox's firefox.exe so that way the icon for Nightly will look like Firefox everywhere, such as the taskbar the Task Manager.

I forgot to mention that I am running Windows 8.1.

Thanks for the help.

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Change it as you would any taskbar icon:

  1. Right-click the Nightly icon on the taskbar.
  2. In the menu that pops up, right-click Nightly and choose Properties.
  3. In the Properties window, click the Shortcut tab.
  4. Click the Change Icon button, select your custom icon and click the OK button.
  5. Click the OK button to close the Properties window.
  6. If Nightly is currently running, you'll may need to exit and restart it for the change to take effect.

There's a way to change the application icon in Firefox, but it won't affect much. If you've already done the above, then in current versions of Windows it'll probably only affect the icon shown in the Alt+Tab application switcher.

Name your icon main-window.ico and place it in the following folder. The folder doesn't exist by default and must be created manually.

C:\Program Files (x86)\Nightly\browser\chrome\icons\default

Don't tamper with any Firefox installation files, the executable in particular.

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That didn't work. I even restarted my Windows Explorer to see if it would rebuild the taskbar icons.

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If you want to clear the Windows icon cache, you have to first delete it in order for Windows to rebuild it:

1. Exit all applications.
2. Right-click on the taskbar and choose Task Manager.
3. Click More details at the bottom.
4. In the Task Manager window, click the Details tab.
5. Select the explorer.exe process, click the End Process button and confirm the action.
6. Open the File menu and choose New Task. Type cmd.exe and press Enter.
7. In the command prompt window, type the following. Press Enter after each line.

cd %LocalAppData%
attrib –h IconCache.db
del IconCache.db

8. In the Task Manager window, open the File menu and choose New Task. Type explorer.exe and press Enter.

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