Yep if you're willing to trade weight you can easily get a core i7-3840QM which can do 8 threads (4 cores) fairly fast. My current one I've been able to emulate some of the last gen consoles even for fun, compiling Firefox or Firefox OS is largely going to be an issue of disk speed which is fixable with either gobs of ram or and SSD, (preferably both, though overprices the alienware m18x r2 will take multiple drives, an msata ssd, and 32gb of ram and can be upgraded to workstation graphics cards if you have the cash).