That usually means that Firefox doesn't have the original compressed JPG or PNG image, but only the uncompressed image as displayed.

Does that happen with all images or only with large images?

Are you running Firefox in permanent Private Browsing mode?

• https://support.mozilla.com/kb/Private+Browsing

I have this problem on my laptop running Windows 7 64 bit and Firefox 5, but not on my computer using Vista 64 bit and Firefox 5. I don't know if the laptop did this with earlier versions of FF as it's been a year since I had Internet access on that. The Vista machine has never done it.

The symptom is that the the image gets saved as a .bmp with some random alphanumerical password-type name, so dragging and dropping the same image 15 times will not result in a "Do you want to overwrite this file" message; just 15 copies of the same image.

I am not using private browsing, and it seems to be all images. I can still right-click and save file to be prompted to save the correctly named .jpg file

Since this is on here a few times on a few threads here is the fix that worked for me on XP it should work on all platforms.

1. Back up the contents of your Firefox profile folder. (See Link Below) https://support.mozilla.com/en-US/kb/Backing%20up%20your%20information?s=backing+up+your+profile&r=0&as=s

2. Uninstall fire fox vand all personal info (book marks, passwords, cookies etc. remember you have all of thet backed up.) Via control panel.

3. Go look where it was installed and see if there is still a Mozilla Firefox folder if so then delete that too (make sure you have no other programs in that folder like Thunderbird)

4. Reboot.

5. Reinstall a fresh install of firefox.

6. Try dragging an image from a website to your desktop and see if it saves and a .jpg. If it works great it's fixed.

7. Now Restore your backed up settings, plugin etc... Look for your new profile folder and then overwrite the contents of that folder with the contents of your back up folder.

Now you can save the 3 hours it took me to figure out this solution.