I'm old enough to remember the news of a "young kid" taking on Mozilla, IE and Netscape with their super lean Firefox browser, that was 20 years ago. It was meant to be lean, with the ability to install additional optional functionality through Plugins.

Now Firefox is old and bloated (Pocket?). It never got to be "lean" (always struggling with memory leaks, bad performance, etc) and poor compatibility (not Firefox fault, but still Firefox problem).