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how to disable file protocol in firefox?

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Currently few of my customers are accessing the Citrix servers. Although I have disabled local drive access they can still access through firefox using format file:///c:/users ... How to disable it? I have already disabled in chrome and edge but I don't see any option in firefox.

Please help

Currently few of my customers are accessing the Citrix servers. Although I have disabled local drive access they can still access through firefox using format file:///c:/users ... How to disable it? I have already disabled in chrome and edge but I don't see any option in firefox. Please help

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I know that this ability has been on the list to be added to the Firefox policies for quite some time, but I don't believe it's been added yet.