I’ve moved from Iceweasel to Firefox 3 beta4, and I’m in love. The bookmark handling is sweet. You can just edit a bookmark by going to the page and clicking on a little icon in the location bar. You can add and remove bookmarks right there, too. The save-password dialog box has been replaced with a box like the “pop-up blocked” thing that shows up just under the toolbars on FF2/Iceweasel, so you can decide whether or not to save it after you’re sure it was successful.
Best of all, the beta is way faster than Iceweasel ever was.
My only legit issue* with it is the ginormous drop-down that appears when you are entering URLs. If your mouse is hovering over a link in the drop-down, you can’t take proper advantage of the tab-completion — it’ll end up using your URL you’re hovering over. I think that might have been the case before, but it didn’t come up as often because the menu was so much smaller. I’m counting it as a focus issue, something that plagues Linux window managers and applications.
That rant said, I’m giving this browser the dpk stamp of approval.
* That is, other than that some plugins aren’t available for it yet.