How to run Firefox in Protected Mode? (i.e. at low integrity level)

Posted by Ian Boyd on Super User See other posts from Super User or by Ian Boyd
Published on 2009-08-27T12:38:51Z Indexed on 2010/04/07 9:13 UTC
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i noticed that Firefox, unlike Chrome and Internet Explorer, doesn't run in the Low Mandatory Level (aka Protected Mode, Low Integrity)

Google Chrome:

alt text

Microsoft Internet Explorer:

Mozilla Firefox:

alt text

Following Microsoft's instructions, i can manually force Firefox into Low Integrity Mode by using:

icacls firefox.exe /setintegritylevel Low

But Firefox doesn't react well to not running with enough rights:

alt text

i like the security of knowing that my browser is running with less rights than i have. Is there a way to run Firefox into low rights mode? Is Mozilla planning on adding "protected mode" sometime? Has someone found a workaround to Firefox not handling low rights mode?


From a July 2007 interview with Mike Schroepfer, VP of Engineering at the Mozilla Foundation:

...we also believe in defense in depth and are investigating protected mode along with many other techniques to improve security for future releases.

After a year and a half it doesn't seem like it is a priority.

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