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why was xulrunner 1.9.1 installed as add-on when I updated firefox from 3.6.11 to 3.6.12 today (10/28)?

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why was 'XULrunner 1.9.1' installed as add-on when I updated firefox from 3.6.11 to 3.6.12 today (10/28)?

why was 'XULrunner 1.9.1' installed as add-on when I updated firefox from 3.6.11 to 3.6.12 today (10/28)?

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Where did you get that update?

Via Help > Check for Updates or did you download that update from another website?

XULRunner 1.9.1 is considered malware: /questions/743526 and /questions/749007