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" This PDF document contains forms. The filling of form fields is not supported" -help?

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I need to fill in & submit online forms but I keep getting the above message. I realise I can view and fill in the forms in an adobe window, but I need to do this online, and it is a secure website with the form imbedded. Is there any way I can have the "filling of form fields" supported so I can do this, please?

I need to fill in & submit online forms but I keep getting the above message. I realise I can view and fill in the forms in an adobe window, but I need to do this online, and it is a secure website with the form imbedded. Is there any way I can have the "filling of form fields" supported so I can do this, please?

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To switch from the less full featured built-in viewer to Adobe's Acrobat plugin, see the steps in this article: View PDF files using Firefox’s built-in viewer.

Can you get it working?