The Firefox error AUS: Update XML File Malformed (200) is a general update error message that can not be attributed to one specific error. Generally speaking the error can be related to the offline mode, proxy servers, network connections or https related. This are only a few of the possibilities and I would like to explain what you can do to fix this issue.
You can of course check everything mentioned above which will probably lead to the setting or element that causes the error AUS: Update XML File Malformed (200) to appear. I would propose two methods instead which update Firefox without having to find the error message first.
The first that comes to my mind is simply download the newest version of Firefox from Mozilla and install it over the old version. This updates Firefox to the latest version. Another possibility – if you want to use the Update Checker – is to create a new profile in Firefox and use that profile to update Firefox.
The second method won’t work all the time depending on the cause of the error message but it can help if the error is related to options, extensions or cookies in the current Firefox profile.
To create a new profile under Windows for Firefox you need to close Firefox completely and start it with the parameter Firefox -P which will open the profile manager. Once inside click on Create Profile and uncheck Don’t ask at startup. Start Firefox and select the new profile and use it to update Firefox
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Well, it’s a hack all right.
“I would propose two methods instead which update Firefox without having to find the error message first.”
That’s about as hackish as you can get. Most of us would prefer to find and fix the CAUSE of the error, so any OTHER errors caused by the same problem will ALSO go away. In general, a reliable computer doesn’t HAVE unexplained, ignored error messages.
“This are only a few of the possibilities and I would like to explain what you can do to fix this issue…You can of course check everything mentioned above”
Well, no you can’t. You just said there’s a large number of possibilities, you listed only a few, and said nothing about how to find OR fix any of them.
Hi,
renaming/deleting of file cert8.db in the folder of my firefox profile fixed this update problem.
Best regards
Hetti
renaming/deleting of file cert8.db in the folder of my firefox profile fixed this update problem
This worked for me as well.
“renaming/deleting of file cert8.db in the folder of my firefox profile fixed this update problem”
Worked like a charm !!
hate to ask such a simple question, but how do i access my firefox profile folder?
Going to Tools/Options/Privacy/Show Cookies and deleting any and all cookies containing “Mozilla” usually works for me.
Thanks, deleting mozilla cookies did the trick.
This did not help me but I will share what did work
Check your Firewall settings it may be set to block everything without asking you first.
Also try to look at the log to see what it has blocked and what programs are listed as trusted and be sure to add it as a trusted program if you can.
Just by disabling it for 5 minutes showed me that’s where the problem was it was not my pc where mine are configured properly so it did not even cross my mind when I was trying to help my Dad that the problem was the firewall.