For Mozilla 1.x Users

Main Differences

Mozilla 1.x / Netscape 7.x	Firefox
Mail & Newsgroups	A separate mail client is now provided - Thunderbird
Composer	Beta version of a stand alone HTML editor, based on Composer, is available from Disruptive Innovations - Nvu
Chatzilla	Available as a separate extension - Chatzilla
Sidebar (F9)	Bookmarks sidebar (Ctrl+B) History sidebar (Ctrl+H) Web Search (Ctrl+K) Web content saved as bookmarks, allows any web page to be opened in the sidebar.
Minimize toolbars	Not available (toolbars can be hidden completely via the context menu or View menu)
Toolbar button selection (Preferences)	Customize Toolbar dialog (right-click toolbar -> Customize...)
Open location bar address in a new tab (Ctrl+Enter)	Alt+Enter
Save/Fill-in form info	Not available (partially replaced by form in-line autocomplete
Edit -> Preferences	Tools -> Options (in Windows); Firefox -> Preferences (in OS X)
Classic and Modern themes	Replaced by a new default theme. Perennial and GrayModern are two themes that resemble the look of Mozilla 1.x
Autocomplete Best Match As You Type	In about:config, add a boolean parameter browser.urlbar.autoFill. Change its value to true
Find As You Type	Options -> Advanced -> Accessibility: check "Begin finding when you begin typing" Alternatively, change accessibility.typeaheadfind to true
Find As You Type - Links Only mode	Same as above, but also change accessibility.typeaheadfind.linksonly to true
Add Tabs (bookmark groups preference)	Change browser.tabs.loadFolderAndReplace to false
New Tab button	Can be added using the Customize Toolbar dialog. To place this button on the tab-bar, use the Toolbar Enhancements extension
Interface to switch between language packs	Available via the Locale Switcher extension
Site Navigation Bar	Available via the Link Toolbar extension

Mozilla 1.x / Netscape 7.x

Firefox

Mail & Newsgroups

A separate mail client is now provided - Thunderbird

Composer

Beta version of a stand alone HTML editor, based on Composer, is available from Disruptive Innovations - Nvu

Chatzilla

Available as a separate extension - Chatzilla

Sidebar (F9)

Bookmarks sidebar (Ctrl+B)
History sidebar (Ctrl+H)
Web Search (Ctrl+K)
Web content saved as bookmarks, allows any web page to be opened in the sidebar.

Minimize toolbars

Not available (toolbars can be hidden completely via the context menu or View menu)

Toolbar button selection (Preferences)

Customize Toolbar dialog (right-click toolbar -> Customize...)

Open location bar address in a new tab (Ctrl+Enter)

Alt+Enter

Save/Fill-in form info

Not available (partially replaced by form in-line autocomplete

Edit -> Preferences

Tools -> Options (in Windows); Firefox -> Preferences (in OS X)

Classic and Modern themes

Replaced by a new default theme. Perennial and GrayModern are two themes that resemble the look of Mozilla 1.x

Autocomplete Best Match As You Type

In about:config, add a boolean parameter browser.urlbar.autoFill. Change its value to true

Find As You Type

Options -> Advanced -> Accessibility: check "Begin finding when you begin typing"
Alternatively, change accessibility.typeaheadfind to true

Find As You Type - Links Only mode

Same as above, but also change accessibility.typeaheadfind.linksonly to true

Add Tabs (bookmark groups preference)

Change browser.tabs.loadFolderAndReplace to false

New Tab button

Can be added using the Customize Toolbar dialog. To place this button on the tab-bar, use the Toolbar Enhancements extension

Interface to switch between language packs

Available via the Locale Switcher extension

Site Navigation Bar

Available via the Link Toolbar extension

About Your Mozilla Bookmarks and Settings

Firefox has a new feature that imports your existing bookmarks, passwords and cookies from Mozilla 1.x and Netscape 6/7. It will run when you first install Firefox (and is also available later through File > Import), and it attempts to import your Mozilla bookmarks, passwords and cookies. This saves you time customizing Firefox to fit your needs.

Firefox's Features not available in Mozilla 1.x and Netscape 7.x

Live Bookmarks: Live Bookmarks is a new technology in Firefox that lets you view RSS news and blog headlines in the bookmarks toolbar or bookmarks menu. With one glance, quickly see the latest headlines from your favorite sites. For more information see Live Bookmarks.
Smarter Search: Google Search is built right into the toolbar, and there are a plethora of other search tools including an easy way to add Smart Keywords for search pages, and the new Find bar (which finds text as you type without covering up anything).
New Extension and Theme managers: Provide a central interface for easy installation, removal and configuration of add-ons.
Inline Auto-complete: All form fields can auto-complete previously typed values. No need to re-type those search strings.
Clean new interface: Firefox interface is simpler and less packed. Less common needs are answered by more than 120 extensions available for download at update.mozilla.org and other sites.
Toolbar customization: Toolbars and buttons are highly flexible, offering complete customization using drag and drop.

Keyboard Shortcuts

You will notice that Mozilla 1.x, Netscape 7.x and Firefox share many of the same shortcut keys. For a full list of shortcut keys, see the List of Firefox Keyboard Shortcuts.

For Mozilla 1.x and Netscape 7.x Users

Main Differences

About Your Mozilla Bookmarks and Settings

Firefox's Features not available in Mozilla 1.x and Netscape 7.x

Keyboard Shortcuts