I use Maxathon on my computers with tiny amounts of RAM, like my old 866mhz 128mb machine that runs WindowsXP. I've got a minimalistic install of WindowsXP on it and use it for only browsing the web. Firefox was too slow on that machine with how many tabs I like to open up, yet with Maxathon I had open 30 tabs and in task manager, it was only using about 15-20mb of RAM.

The main pitfalls of the app are it's still based on IE so the DOM Firefox support isn't there, and while Maxathon has an "AdBlock" like feature, Firefox's is cleaner and collapses the page where graphics previously were, while Maxathon keeps the ad space open and blank. And it still isn't great about handling file opening (torrent especially).

Overall it's a great little browser and on old machines I can live with its few features I wish worked differently in exchange for super low memory usage.