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for quite a few sites that I visit, firefox defaults to 'mobile' view as if I was using it from a smartphone or similar device.
This happens even after deleting the package and all of the preferences I can find and reinstalling.
Is this normal, quirky behavior or does it point to malicious activity?
I am using OS X 10.5.x

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migrated from Sep 3 '11 at 22:36

This question came from our site for information security professionals.

This really is not related to security in any way, is it... – AviD Sep 3 '11 at 22:34
up vote 3 down vote accepted

To answer the question: Based on the information you provided I do not think there is any reason to suggest malware is involved.

To help you troubleshoot this: It does sound like you user agent string was modified for some reason. You can easily view the string from this site:

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the user agent string looks correct AFAIK: Mozilla/5.0 Macintosh Intel Mac OS X 10.5 rv 6.0.1 Gecko/20100101 Firefox/6.0.1 ----Does that look normal? i will accept your answer, but I want to leave it open for a bit to see if there is any more input – fightermagethief Sep 1 '11 at 23:31

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