Zotero add-on removes journal access

Hi

I have a strange problem. I cannot access anything to do with Nature Publishing group and a few other journals, including simple access to the home page. I have disabled my add-ons one-by-one in Firefox, and I have discovered that this is caused by the Zotero add-on.

I have Zotero version 2.0.3

This has been happening for a while, but I only just thought to look at the add-ons.

Can anyone help with this?

Thanks

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