You can hardly say that Firefox is free from some... questionable business practices.
For one, the devs use a system called SPDY 2.0 / 3.0, which dynamically compresses data sent and received through servers owned by -- take a guess -- Google! Talk about potential for unwarranted surveillance! And as if that weren't enough, Mozilla is taking a much stronger interest in working together with Google in recent months, which kinda goes to show that this humble community project has strayed away from web standards in favor of maintaining competition.
Also, prefetching is enabled by default in FF, and it is not made obvious for the average Joe how to alter this.
So! Based purely on handling of lone tabs, media, and page-load speed on the links most click-worthy, Chromium based code outshines Gecko in a number of ways, and by extension, much better for my own purposes. As for lagging with tons of pages open, Google is working on that! Firefox still takes the cake for the hardcore userbase in that regard.