Firefox 4 crashes when loading pdf and other sites unless I first open it in safe mode and then revert

So firefox 4 crashes when opening in-browser pdfs and a whole host of other sites, even with no addons running.
I've found a fix: start in safe mode, then close and open in normal mode. This always solves the problem.
But '''why?''' What is causing this incredibly annoying problem. I went from happily browsing at high speeds (firefox 3.6) to suddenly finding myself propping my head on my arm, looking at a jammed firefox, trying not to go crazy, for about 2 minutes until it unjams (for pdfs - for the other sites it doesnt unjam) - and the pdf page ends up just black. God forbid I press F5 again lest I want to relive the experience.
This only happens on my work laptop. It's a top of the line laptop. It connects via a remote VPN. I'm not sure if that's relevant but I'm trying to give as much info as possible.

1. You have a pre-release Beta 1 version of what will become Firefox 4 in like 5 or 6 months. Unless you are intending to test it for flaws and report those flaws to help in the development process, don't use it.
2. Did you create a new Profile for 4.0b1, and are you using that Profile with it? ''That isn't done automatically when you install 4.0b1, and those of us who have been doing the "testing" for many years consider a new Profile as the basis of doing out testing.''
[http://support.mozilla.com/en-US/kb/Managing+Profiles]
IMO, Mozilla is making a huge mistake by directly offering these beta versions to the general public.
Also IMO. if you want to play with 4.0b1, use the Portable Firefox 4.0beta version to minimize any conflicts with a currently installed version of Firefox, and to eliminate the need for creating a new Profile for 4.0 Beta #:
Download Firefox Portable Test to your hard drive and double click the '''FirefoxPortableTest_4.0_Beta_#_English.paf.exe''' file. The entire installation (including a new Profile for "Portable") will be self-contained in the \Program Files\FirefoxPortableTest\ folder and won't interfere with an "official" version that you already have installed. Your Profile will be in the \Program Files\FirefoxPortableTest\Data\profile\ folder.
The "down side" is that Firefox Portable won't launch if any other version of Firefox is already running.
[http://portableapps.com/apps/internet/firefox_portable/test]

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