Windows 7 - Firefox 3.0.11 - Missing Icon

Sorry to bump such an old thread, but I just wanted to say thanks to AntiStar and Generator. The missing icon for Firefox was really stating to bug me.

We've had this suddenly happen on all our images.
We're using x64 Enterprise edition.

You'll notice, if you open the shortcut properties > change icon, it'll refer to %programfiles%/mozilla firefox/firefox.exe
Of course this location doesnt exist, because FF has been installed to %programfiles(x86)%/mozilla firefox

Deleting and recreating the iconcache.db didnt work, so our workaround was to create the %programfiles%/mozilla firefox folder, and copy/paste only firefox.exe to there.
It wont run without errors, but thats ok. It only needs to pick up the icon, which it does now.

Strange, deleting icon and thumbnail cache did the trick for me.

@xarden, your solution worked for me with some modifications. Actually, I was using FF4.0b8 and when I ported to b9, I changed the folder name from to "Mozilla Firefox 4.0" in %programfiles(x86)% folder. I have two shortcuts for firefox in start-menu for a personal and default profile. The application targets are {"C:\Program Files (x86)\Mozilla Firefox 4.0\firefox.exe" -p "personal" -no-remote"} & {"C:\Program Files (x86)\Mozilla Firefox 4.0\firefox.exe" -p "default" -no-remote"} respectively, which resulted in lost of icon (after couple of hibernates!!). Now, I changed the Icon location (for both the icons) to " %programfiles(x86)%\Mozilla Firefox 4.0\firefox.exe " and the icons are back. So for x64 users, no need to mkdir and copy firefox.exe in %programfiles%.
[Incidentally, at Firefox Nightly Builds there is a built for 64bit too, but it appears to me, Mozilla's update is not pushing the proper versions to clients! Or is it an unofficial third-party release (on official site!)?]

I had this problem too in FF3 (3.6.17 but I'm pretty sure it started with an earlier version). Deleting the icon cache didn't work, and while I've come across solutions that involve changing the registry, I didn't want to do that myself. However, I found that it was solved by uninstalling and reinstalling, as follows:

First, take a backup of everything using MozBackup. Then uninstall FF3, selecting the option to completely remove personal settings. Then reinstall FF3, but without creating a new profile. Close it, and restore the old profile with MozBackup. After this the file icons were as they used to be.

One thing to bear in mind: the profile in the new installation has a different name (the seemingly random sequence of letters and/or numbers) from the old one, so if you have any backup programs etc which refer to it you might need to change their settings.

After this I actually upgraded immediately to FF4, and the icons stayed as they should be. It might have been possible to simply install v.4 without putting v.3 on again, but in my case, one of my add-ons (a viewer for the family history site Ancestry) apparently can't be installed from v.4, but will continue to work if it was in v.3 which is then upgraded.

In case anyone is wondering, I had first tried upgrading FF3 with wrong icons directly to FF4, but this didn't solve the problem. It was only the uninstall/reinstall that worked.

Hope this helps others who don't like changing the registry!

AntiStar's Rebuild the Icon Cache resolved the issue for me