Hi gbhalv, can you post a screen shot of this:

Once daily in the morning a screen pops up that looks exactly like Mozilla requesting to download an update immediately for a Java update.

If it is an orange page with a Firefox Logo in the center that pops up a download dialog for an urgent patch:

That is a malware distribution page and you are being protected from the download by your security software. When a download dialog is displayed, Firefox starts downloading the file to the TEMP folder in the background on the assumption that most likely you'll keep the file. If you cancel, Firefox discards the file. However, because the malware installer is a small file that downloads quickly, your security software is quarantining or deleting it before you can click Cancel.

Those pages are promoted through advertising networks on popular sites. Do you recall what site(s) you were using before the pages appeared?

As a another layer of protection, consider using an ad blocking extension such as: https://addons.mozilla.org/firefox/addon/ublock-origin/ (adds a toolbar button so you can make exceptions where needed)

Note: the same malware distributors are targeting Google Chrome, so if you switch to Chrome, consider installing an ad blocker for Chrome as well.

gbhalv said

Once daily in the morning a screen pops up that looks exactly like Mozilla requesting to download an update immediately for a Java update. My virus protection is warning me it is a virus DFgWXQ00.js.part. Is warning me is a bad virus. I just started using Firefox about a week ago as once before I got a bad virus using your browser. Now I am about to uninstall once again and go back to another browser. I have been warned to stay away from your browser because of viruses. What seems to be your problem with security????

This is due to malicious Ad's on some sites that is targeting some Firefox users on Windows based on useragents and the appearance of the urgent update page was made to try and trick less experienced Windows and or Firefox users into downloading a Fake firefox-patch.js file and run it before scanning and from fact that they were not on a legit *.mozilla.org page. These scammers are using a similar fake urgent update page for Google Chrome users on Windows also and I have seen at least one instance of a fake Adobe Flash Player download site from them so far.

There is no security concerns in Firefox nor is Firefox prone to viruses compared to any other supported web browser.

The firefox-patch.js file is only a danger (on Windows) if the user were to try and run it vs just deleting if saved to disk.

These fake firefox-patch.js files are JavaScript and not Java as JavaScript and the Java Plugin are two different things. http://kb.mozillazine.org/JavaScript_is_not_Java

These sites used for the fake urgent update scam for Firefox (and the similar one for Chrome) are disposable as they are being used for a day or so and then not used again.

Also of note, if a antivirus scanner says you have something malicious in your Cache then it is harmless while there as it gets overwritten or if scanner claims something that is a part of Firefox is infected etc that may just be a false positive. You should ask before jumping to conclusions.