PDF files in firefox

[Timothy Murphy]

Aaron Konstam wrote:

>> >> Is there any way to get firefox to use xpdf
>> >> to read PDF files, rather than Adobe Acroread?
>> > 
>> > Yes. First, uninstall the acrobat plugin. Then, it basically takes care
>> > of itself.
>> 
>> Where exactly is the acrobat plugin stored?
>> There doesn't seem to be anything relevant in .mozilla/plugins/ .
>> 
> It an be in /usr/lib/mozilla/plugins or /usr/lib/firefox../plugins
> 
> But to do what you want got to: about:config
> Change:
> browser.download.hide_plugins_without_extensions to false
> 
> The in: Edit->Preferences->Content->Manage you can make firefox any
> program you want to open pdf files.

Thanks for the advice.
I didn't find anything about PDF in any of the plugin directories.
I made the change you suggest with about:config
(and restarted firefox) but again found nothing relevant
in Preferences=>Content=>Manage.

I'm not sure now where I had the problem, 
but I'll let you know how I get on ...