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cannot enable PDF extn for Firefox

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I am unable to convert web pages to PDF documents. NO PDF extn. Cannot find the Add On, or enable the add on.

I am unable to convert web pages to PDF documents. NO PDF extn. Cannot find the Add On, or enable the add on.

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You seem to have two PDF Plugins. Adobe PDF Plug-In For Firefox and Netscape 11.0.14 Adobe PDF Plug-In For Firefox and Netscape 15.10.20056

You should get rid of the older one.

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I have no plug ins at all. I am trying to install one, unsuccessfully

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On the PC that you used to post here, there are 14 installed plugins listed in the forum software. See the More System Details in the right-hand column.

Or is your support question about a different PC?