Re: Shockwave doesn't work (Some games don't work)
Judging from all disabled extensions, I assume that you use a Firefox 3.6.x profile with that 4.0 beta version.
You can try a new profile for the 4.0 beta version. That is especially recommended if you still use the Firefox 3.6.x version, but it is better to do that with such a test release to remove all remnants from older Firefox 3.6 or earlier beta version that are no longer or differently supported (e.g history).
Create a new profile exclusively for the 4.0 beta version and create a desktop shortcut with -P "profile" appended to the target to launch that profile.