The following list is my impression of the most important enhancements of the Mozilla Suite (now called SeaMonkey) as compared to Netscape 4.X. A website comparing Mozilla's features with IE is somewhere else. Mozilla.org themselves also have some pages explaining why somebody would want to use Mozilla.
- It is Open Source. That means in principle you can fix all the bugs that you find yourself.
- It is more stable than Communicator 4.X.
- Mozilla has all recent security fixes.
- It has support for all current standards like XML, MathML (on some platforms), XHTML, HTML 4.01, CSS 1+2, etc.
- Under Unix it will adapt to the current GTK interface theme when using Classic theme. On OS/2 it will also use the fonts used in PM programs.
- It allows to install packages for other languages, Themes, and add-on tools and enhancements (see e.g. MNG/JNG support above).
- Uses notebook-like "tabs" to display several webpages within one browser window.
- You can have a group bookmarks which are load all the pages in different tabs.
- An internet search engine of your choice can be integrated into the URL bar.
- A document navigation bar using the "link rel" tags in the HTML code. Switch it on under View->Show/Hide->Site Navigation Bar.
- The "sidebar" can display bookmarks, the browsing history, search engine output, and news tickers.
- It supports "favicons" in any image format.
- Full support for PNG (alpha transparency), JNG (JPEGs with transparency), and a subset of animated MNG images was added. (For MNG/JNG support after version 1.4.x see builds page.)
- Mozilla has the ability to save form information on webpages, passwords for logging into sites.
- and it can encrypt saved information before it is saved to disk.
- Mozilla can automatically resize images which do not fit in the browser window.
- It can save whole webpages to disk (with all images etc. included!).
- It has some features to enhance performance of HTTP networking.
- Link Prefetching means that it can automatically pre-load stuff while you are reading a page.
- Rich text editing controls in webpages, called Midas.
- It adds a chat component Chatzilla.
- Multiple user profiles are supported and can be switched on the fly.
- You can now also have multiple POP/IMAP inboxes.
- A somewhat "intelligent" junkmail filter mechanism for emails.
- Keyboard navigation, allowing to find links and text while typing.
- Smooth scrolling when using the keyboard to scroll.
- You can have a group of homepages which are loaded in several tabs.
- A download manager, keeping a history of all files loaded from the web, is included.
- On OS/2 you can Ctrl-Drag to save images and webpages to WPS folders via drag-and-drop.
- On OS/2 Mozilla can used smooth font display via antialiasing from the InnoTek Font Engine. The same is possible on Linux with GTK2.
- A Calendar component
Unfortunately, Mozilla also needs much more RAM than older browsers, easily 40MB and up to 100MB and more after a few hours of internet browsing.
The feature set of the standalone Mozilla product, the Firefox browser and the Thunderbird Mail- and Newsclient, is comparable to the above, but for some features one has to install extra extensions.
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