Previously I talked about:
Turbo Speed and Less Memory, Full Page Zoom and Drag everywhere (Pt 1 & 2)
Awesome Bar and Security in a Box (Pt 3)
Here and there, all the rest (Pt5)
There are many changes that are subtle but very nice, hopefully you won't miss them!
This part I will introduce two features that intended to improve the ease of use.
7. Passwords....
8. Download Manager
Download Manager has been re-designed. Many handy tools you might like...
right click individual download will give you these options
In the download manager, you can find the information related to each download, they are:
I will be talking about some even subtle changes in firefox next time, stay tuned.
PS. Maybe I should reorganize everything later...
Turbo Speed and Less Memory, Full Page Zoom and Drag everywhere (Pt 1 & 2)
Awesome Bar and Security in a Box (Pt 3)
Here and there, all the rest (Pt5)
There are many changes that are subtle but very nice, hopefully you won't miss them!
7. Passwords....
When we type in a pair of username/password and click "login", Firefox 2 will pop up a dialogue ask if you want to "save the password", "not now", "never for this website"..
However, what if you are not sure whether the passwords/usernames you just entered is right or not? popup won't go away until you pick a choice
...
Now, In firefox 3, it will only display a info bar on the top of the page, it will stay there until you leave the page or choose an action. And it will NOT force you to make choice before the successful login process!
Never again remember the wrong passwords 

Download Manager has been re-designed. Many handy tools you might like...
Note: firefox will not automatically remove file's name from download histoty list, due to improved mechanism of database, now you can keep all your download histoy (you can still right click to remove them manually)
Now first take a look at this manager

right click individual download will give you these options

when each of the files was downloaded.
Names of the files
websites from which the files were downloaded
Size of the downloads
Now, did you see the search field at the bottom of download manager? and YES, you can search your download by all the info listed above. Names of the files
websites from which the files were downloaded
Size of the downloads
search by its name
Search by the time you download it
Search by the websites from which the file was downloaded
Search by size of the downloaded files
There are even more new exciting things about the downloading in firefox 3
Search by the time you download it

Search by the websites from which the file was downloaded

Search by size of the downloaded files

Now you can now resume downloads after restarting the browser or resetting your network connection.
And You can check the status of active download from status bar
And You can check the status of active download from status bar

I will be talking about some even subtle changes in firefox next time, stay tuned.
PS. Maybe I should reorganize everything later...