Hi all. I'm just here to express some of the pros and cons that I've experienced with this new beta. Feel free to share anything you got.

Pros:
I finally got "Pr0n mode"
Loads a few seconds faster compared to 3.0.10
Gets 97 out of 100 in Acid3 on clean and regular loaded profile
New tab button like in IE 7 & 8, lets face it its in a convenient place.
Works with my profiles I set up for others to make it more convenient and easy to use compared to stock, also glassed it with Ambroos' glasser v2 thanks for that btw
No crashes yet, Firefox 3.0 betas and RCs crashed once in a while when watching flash, Adobe finally got that right too.

Cons:
Clear private data needs an option to never show itself unless changed in the options menu, it can be annoying for some to always ctrl + shift + del and have to press enter or maybe I prefer 3.0 behavior.
Still no Windows 7 integration yet, why keep us waiting for version 4.0 when 7 is around the corner possibly in September and beyond...
Still in version 3.0 too - it should expand the "Save Download" window where you pick a directory to save to for Vista and 7, some people get confused and lost since its shrinked down.
They need a feature where you could reopen accidentally closed tabs even though there is an extension.
I'm too lazy to install Nightly Tester Tools

edit: I put 97 for Acid3 score, I meant 93 sorry thanks for pointing it out, The_Decryptor

3.5 is almost finished, it's too late to try to add in support for certain Windows 7 features.

You should also only be getting 93 out of 100.

You can re-open recently closed tabs (i.e. tabs which you have accidentally closed) by navigating to 'History > Recently Closed Tabs'. This has been here since at least Firefox 3.0 - it's a very handy feature

I'm guessing that the extension works off of that then, only as a button to do the menu opening in one click.

That is does. I also need to update the extension for 3.5.