Cannot Drill From (PDF) using FF in Cognos Report Studio
Using Cognos Report Studio I can Drill From a PDF Report to another Report in IE. I cannot Drill From a PDF Report to another Report in FF.
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The PDF Viewer introduced in Firefox 19 does not (yet) have all the features of Adobe's PDF Plugin. You can switch using the settings described in this article: View PDF files using Firefox’s built-in viewer.
The viewer is under active development, but I don't know how soon the feature you're using will be supported.