context menu toggle to allow ads on a site

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Describe the issue

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Steps for anyone to reproduce the issue

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Your settings

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Your custom filters (if any)

Hi I use a screen reader and cant allow ads for a site I want to support such as http://www.phoronix.com/scan.php?page=home

I am using firefox 51 and want to use the applications key to bring up the context menu to allow ads for a site. I cant click in the toolbar as i do not use the mouse thanks