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I can not acess my contact list.

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I click on "Mail" drop down and select "Contacts", it indicates it is loading, but does not open. This has occurred since I update to the new Firefox Gmail page format.

I click on "Mail" drop down and select "Contacts", it indicates it is loading, but does not open. This has occurred since I update to the new Firefox Gmail page format.

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Try updating your "Adblock Plus" filter subscriptions

Undesired content is often a bottleneck, if that doesn't work try disabling ADP at its toolbar icon then if that works try to find out which filter. Besides the above link, also see