According to macosxhints.com, in 10.6 the icons for standard Mac OS X applications (or even Apple software in general) might no longer be easily changed, as the application folders are kind of read-only. One could of course change those access rights, but changing the package contents might break the 's signature for that application. And if the signature becomes invalid, then applications might no longer be allowed to access the keychain, will no longer be allowed an exception in the firewall if it's known to check its own integrity (known to have caused trouble for ), or might cause trouble when using software update. (Above, might indicates that I am not sure. Some quick tests changing the iTunes, Safari and Activity Monitor icons did not break the Code Signing, though for some other, yet unknown reason the firewall might repeatedly ask For more details see ). Mac code for a square symbol. Old topic I know, but better than raising a new one. This is relevant to the question.

If you're having trouble getting this to work, like me, then I found a solution. A Firefox update a long time ago brought back the classic icon - I, like many others, use a custom Tails icon (google it, it's really cute!) and I tried to set it back, but it wouldn't have it. Pasting over the icon didn't work. Just this evening I found the problem - within Firefox.app was an Icon file, but when viewed from Terminal it had an unprintable character on the end. Turns out there was a Windows line-ending in the filename (possibly a bug in the update) that prevented the icon being modified ever since.

Deleting this file allowed me to change the icon again. Mac os x for virtualbox.

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