Firefox 4.0 Yahoo 1.8 won't open pdfs

Recently upgraded Firefox. Bad idea. Now it's very slow, some pdfs won't open, and some sites don't open at all. Also, it switched my search tab from Google to Yahoo, zapped Wikipedia from my bookmark toolbar, and put the Yahoo brand at the top of the page. Can I get back to a non-Yahoo version of Firefox? Is there a way to get pdfs to open in this version? Anybody have answers?

Hi....
Quit Safari.
Go to /Library/Internet Plug-Ins
Move the Adobe PDF Browser plugin to the Trash.
Relaunch Safari.
See if that helped...

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Firefox 4.0 Yahoo 1.8 won't open pdfs

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