We all know that Mozilla Firefox 4.0 is under beta testing and the final version will be released soon.
We are keeping our eyes on the whole development very closely. We have a dedicated topic for it:
Download Mozilla Firefox 4.0 Latest Beta Version
The overall UI of Firefox 4.0 is almost complete. Everyone is loving the new changes and enhancements but there are a few things which I hate about it.
NOTE: All the things which we'll talk about in this topic are related to the latest Mozilla Firefox Beta 7 build.

New Mini Progressbar in Addressbar:
Mozilla has replaced the good old progressbar which was used to show in Statusbar with a new Mini progressbar which is now shown in addressbar.
IMO its very hard to notice and doesn't show the actual ratio of loading which the old progressbar used to show.
What Mozilla can do? They can replace the mini progressbar with Apple Safari like full progressbar in addressbar which is easy to notice and shows the actual ratio of loading a web page.
No Progress Activity Icon in Tabs:
The most irritating thing in new UI is the removal of progress activity icon from tabs. Now if a tab is loading, it shows the blank tab icon and once the favicon is displayed, it always shows the favicon whenever you try to navigate that website.
In previous versions, the tab used to show a small animated circle which let us know that the tab is loading. Now we can't know whether the page has completed loading or not unless we take a look at the mini progressbar in addressbar.
Removal of Statusbar:
Another thing to hate is the removal of Statusbar. As the Menubar is still there but is disabled by default, the same thing could be done with Statusbar. There are several people who like Statusbar because it shows everything about page loading. We can see which image, script, etc is currently loading by the tab. Also we can see the progressbar in it.
But now Mozilla has completely removed Statusbar and there is no way to re-enable it.
No RSS Feed icon in Addressbar:
Only God knows why the addressbar doesn't show RSS feed icon for any website? It was very easy to subscribe to RSS feed of any website by just clicking on RSS feed icon in addressbar.
Being a Mozilla Firefox lover and long time user, I hope Mozilla will listen to us and will implement the above mentioned points in coming builds. :)
This article was posted by VG in following section: Mozilla Firefox.
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Hackerpunk1
You Are Right!! Me also is Missing those old good features :-(
Ricardo Pereira
Google Chrome 7 Beta is better ;)
Mozilla Firefox Beta is very boreeeeed.
AKLP
1)New Mini Progressbar in Addressbar
2)Removal of statusbar
3)Hovering links will show right of adressbar instead of statusbar
4)They focus too much on the smallerz (laptops/netbooks etc) and they dont care anymore about the monitors of the pc...
Tomas
Using latest beta of Firefox 4.0. There are lot's of bugs, bet the RSS icon in the address bar you're talking about is still here.
Davo
I find that out of all the browsers at this time, IE9 beta has a sexy UI. Then Chrome, and then Firefox.
Imo, I've always found Firefox's UI a bit... Dodgy. >=]
oddMLan
1. Like HJ said, there's a bug in progress for it.
2. I can't remember what bug is, but there's a bug to fix the blank favicon thing, to show the favicon BEFORE the webpage is fully loaded.
3. I agree with that. Maybe they will add the funcionality of the status bar in the addonbar.
4. I agree with this too.
Xonos
Well...Thanks for the info but unless you all send those feedback to Mozilla directly if not Mozilla won't know it right?
Cruise
I wish the final version comes out clean...!! I am using Google Chrome Now....!!! :P
Mudro
Thanks for the heads up on these annoying changes to the firefox. losing the menu bar and the status bar are real killers for me as I do use both of them enough to justify their needs. And why on earth would they omit the RSS icon in the addressbar ? Seems to me that would be a feature many folks used to keep updated.
Just seems like every time they try to "Sexy up" their UI it hurts my usability and efficiency. I've been a loyal Firefox user since the first version and I will continue to use their browser for as long as i can. But, with all these changes coming in 4.0 it just might be time to look into an alternative as I venture in to the Firefox 4.0 era.
Davo
Well, in terms of speed, I think IE9 has blown all the browsers off. Buttt, it still needs a bit of a clean.
As for Firefox, it takes up alot of resources on my crap netbook and so doesn't really work that well. Of course, the UI... Not to my liking.
Chrome... UI is pretty slick, in terms of HTML 5 speed, sucks crap. I went to the IE9 test lab and tested it, failed badly.
But, this is in my opinion. :)
Just ought to let you know, hehe.