577826 - XULRunner 1.9.1 disabled?

Status: RESOLVED INVALID

(Firefox :: Extension Compatibility, defect)

Description

[Sebastien Jean]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1

In the add-ons Manager of my Firefox 4.0 beta 1, there is the "XULRunner 1.9.1" and it is disabled (incompatible with Firefrox 4.0b1).  Is it necessary? If no, how can I uninstall it? There are no remove button. I can not find any XULRunner directory and the "xulrunner.exe --unregister-global or xulrunner.exe --unregister-user" doesn't work.

Reproducible: Always

Steps to Reproduce:
1.Install 4.0b1 over 3.6.6
2.open add-ons manager
3.XULRunner is disabled
Actual Results:  
XULRunner doing nothing?

Expected Results:  
I only use the Adblock Plus add-on, I don't think I need this XULRunner...

Comment 1

[Daniel Veditz [:dveditz]]

"XULRunner 1.9.1" is a malicious add-on installed by malware on your system (you will probably also find a related "Browser Helper Object" installed in IE under a different name). You definitely don't want it, but you also need to clean the malware off your system (XULRunner 1.9.1 is a symptom, but you need to get rid of the cause).