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Open pdf's in acroread (instructions at disable-built-pdf-viewer-and-use-another-viewer have no effect)
I am running Firefox 22 on a linux laptop. I want to have a choice for pdf's between downloading them and openning in acroread, which was the case until recently. However, in most cases they always open in firefox directly, which I do not want. I have already set my preferences via Edit - Preferences - Applications as described by disable-built-pdf-viewer-and-use-another-viewer (and restarted the browser, and cleared the cache) but it still insists in openning pdf's in the same web page.
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Did you set the pdfjs.disabled pref to true on the about:config page?
That should be enough to disable the built-in PDF Viewer
You can rename (or delete) the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.