Cannot open pdf file with Firefox 11.0

Firefox automatically upgrades the version I am using. Since it was recently upgraded I cannot open pdf files. Am faced with a blank page. I went through some of the suggestions on these pages and when I opened the Tools window, there is a warning:
Firefox PDF Plugin for Mac OS X is incompatible with Firefox 11!
Is there a way around it? Or is it time to say goodbye to Firefox and move to Safari?

When Firefox updates, it turns
off add-ons that are not
compatible with the new
version. In addition, add-ons
that may have been
automatically installed by other
programs without your
knowledge (third party add-
ons) have been disabled. For
more info about re-enabling
add-ons, see the link below.
http://support.mozilla.org/en-US/kb/Add-ons%20are%20disabled%20after%20updating%20Firefox#os=android&browser=m10

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