How do I change the Firefox 23.0 icon back to the old one?

1. Download the Firefox 22.0 release binary from one of these locations:
   • http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/22.0/mac/en-GB/
   • ftp://ftp.mozilla.org/pub/firefox/releases/22.0/mac/en-GB/
2. Double-click to mount the Firefox 22.0.dmg file.
3. Copy the icons using Terminal:
   • cd /Volumes/Firefox/Firefox.app/Contents/Resources/
   • cp document.icns firefox.icns /Applications/Firefox.app/Contents/Resources/
4. Reboot.

Note: If you want to do the copy from Finder, you'll need to right-click on the Firefox.app icon in the mounted dmg file and select "show package contents" then using a separate Finder window do the same thing for /Applications/Firefox.app, then change into Contents/Resources in both windows and copy the files across.

• On each of the Firefox 22 and Firefox 23 apps, right click and select "Get Info".
• In each information windows that pops up, unlock the lock at the lower right (click, and enter admin credentials when prompted).
• In the Firefox 22 information window, click on the small Firefox icon at the upper left and and type Cmd+C.
• In the Firefox 23 information window, click the small icon at the upper left and and type Cmd+V.
• Close the information windows; you're done.