Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I get error when i try to use update check

  • 2 replies
  • 187 have this problem
  • 1 view
  • Last reply by macmilla

more options

Error Message: There were problems checking for downloading, or installing this update. Firefox could not be updated because: "update XML File malformed (200)"

This happened

Not sure how often

== updated to FireFox 3.6.3 / running MSOffice 2007

Error Message: There were problems checking for downloading, or installing this update. Firefox could not be updated because: "update XML File malformed (200)" == This happened == Not sure how often == updated to FireFox 3.6.3 / running MSOffice 2007

Chosen solution

All Replies (2)

more options

Chosen Solution

more options

OK, I checked for everything suggested in "AUS Update XML File Malformed 200" and none of the suggestions seemed applicable: I have no extension named Noscript, I can access secure sites, the url in "about:config" cannot be reset, I have no cookie named "aus2". --But the MERE ACT of trying these suggestions made my "XML File Malformed 200" message go away, at least temporarily -- I can now click Help/CheckForUpdates and the "Malformed" message does not appear, instead a message appears saying (words to the effect of) I have the most recent version, which is true by comparison of Help/About and the version number at the Firefox Updates site.