I use conkeror a lot which is very light on resources:
http://conkeror.org/
If you're an Emacs user then you'll find it really easy to use but it's not too hard to pick up anyway.
Just install palemoon-bin (I got mine from sbopkg, I think it's one from ponce) and xulrunner-1.9.2 from alienbob's 13.37 slackbuild (I have it running in 14.2) and you're good to go.
Start it with:
palemoon-bin --app ~/conkeror/application.ini "$@"
(adjust the path to your conkeror folder accordingly).