Dead-Fish.com

A couple of major elements added in beta 4.

Firefox Sync lets users access browser history, password keychain, bookmarks, and open tabs across their different desktop computers, it's an add-on for Firefox 3.x,  integral in 4.o.

Panorama (formerly  Tab Candy), allows you to arrange  tabs into groups, you can zoom out and see all home screens at once.

Downloads

Is out, clearly the majority of your plugins are not likely to work (from my usage) but you can add an addon-plugin to report faults, but you can experiment with the new version...

I'm not a fan of the vanishing search or address bar, so turned that off.  Also address bar seems to stay stuck on the first URL visited regardless of where you go from there.

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Oops...

Mozilla has admitted in a security notice that two experimental add-ons for its Firefox browser contain Trojans that affect Windows machines.

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OK, pressing Alt to show menus every time I want to see bookmarks annoyed the hell out of me in short order, so Hide Menu Bar (press Alt) got uninstalled.  Despite the fact I have an enormous monitor (2560 x 1600) the chunky and annoying 3 layered version tool bar  in Firefox (4 if you count the status bar) has always annoyed me and the extra room gained by losing the menus needed further investigation.

Eventually I came across Tiny Menu which does NOT, at first glance, do what I want it to:

Tiny Menu as intended

however, what it does do is allow you to drag all the elements in any of you tool bars to where you want.  Once I'd moved them to 1 line, I simply diable Tiny Menu to get this:

Combined version

We'll see if this lasts a bit longer...