You may give avant browser tri-core version a try. It has integrated the engine of firefox and chrome, as well as support the ie engine coming with the windows system. Having used all three engines for a while in avant browser tri-core, I feel that the memory leak problem can't be avoided in firefox engine thoroughly after using long time , particularly some sites badly coded could bring serious memory leak. In this case, chrome engine seems much better compared to firefox engine, as closing some pages can release completely the memory taken by them, as a result, memory leak is prevented. On the other hand, opening too many pages using chrome engine caused the memory usage to be swallowed quickly, in contrast, firefox engine consumes less memory as a whole in normal condition. So everything has two sides, the obverse and the reverse come in company. It's hard to say which is best. Only the one suitable for you could be thought as the best. My opinion is that for some machines with low performance, firefox engine based browser is preferable, while at high performance machines, each one works good. For me, I choose the tri-core browser instead of the real chrome and firefox for saving the trouble of importing and exporting bookmarks and other important data frequently between different browsers. In Avant Browser, the online bookmarks, online autofill, and other preferences can be synced between my office and home, they're share by all three engine as well. The most nifty feature is that I can call any time any engine wanted easily as anywhere I can find the option to call them. The launch speed of the whole browser as well as each engine is rather fast. Furthermore, some sites having rendering problem in certain engine or needing to install extra plugins, I customize them to be rendered by other engines. That means opening the site via the address bar or some other spots in avant browser will start the predefined engine automatically, and this action is transparent to the user. Likewise, the user doesn't know when the engine exit after closing the site. I can think of these advantages so far.