I have been using Firefox from the very beginning and i still do love it, however due to the excessive memory usage i have to find an alternative.

It seems there are quite a few browsers out there that are based on Gecko and WebCore Layout engines. The browsers i list here are web browsers that i found most useful and promising.

Flock (Win/Mac/Linux)

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Flock is a social web browser based upon Firefox, with its own user interface and a number of unique “social” features. Instead of locally stored bookmarks Flockr uses public bookmarks, letting users add bookmarks to del.ico.us “on the fly”. The browser integrates Flickr, Twitter, Facebook, Technorati and further services such as an RSS feed-reader. One good thing about flock is that it uses quite less memory than Firefox and it supports most of the extensions and addons that are available to Firefox (all of my debugging and development addons work well :p )

What makes Flock unique is its ability to improve the productivity of bloggers. E.g. you can publish your blog posts directly from your browser-window — a WYSIWYG-editor is preinstalled by default. You can also use a Web-Clipboard, Photo Uploader, a Mediabar for Flickr-Fotos etc. Flock was released in October 2005, the first stable version was available two years later. Flock uses Yahoo as a default search engine (you can change the default search engine to any engine you want)

Flock is available in Linux, Mac and Windows

Maxthon (Windows)

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Maxthon (earlier MyIE2) is a powerful tabbed browser built for all users. Besides basic browsing functionality, Maxthon Browser provides a rich set of features to improve your surfing experience. Compared to other browsers, Maxthon offers a very user-friendly interface, with a number of skins and plugins. Maxthon is a browser Internet Explorer 6 could have become if Microsoft developers tried to invest more in an optimal user experience. Whatever task you have to accomplish with Maxthon, you always feel absolutely comfortable as the interface is extremely well through-out and intuitive.

Maxthon has the basic functionalities offered by Mozilla family and Opera. It also offers the Anti-Freeze functionality which reacts once the browser seems to have frozen. You can also add shortcuts of your programs in Maxthon, and start them with a single click. You can even set programs to start and shutdown with Maxthon Browser. Screen capture is integrated and URL key-shortcuts can be set up with few clicks.