Firefox was built on Netscape so given the equally terrible experience of developing for Netscape back in the IE6 days I would be surprised if you didnt hate Firefox as well. Both Netscape and IE were terrible to develop for with their proprietary non-standard extensions, Netscape just had the decency to die and be reborn under a different name to make people forget its horrible legacy, IE should have died and been resurrected under a different name around IE10 when Microsoft finally changed tact and brought standards compliance to the forefront.
Contrary to Steve Jobs' comments the Internet Explorer of those days was *not* a very good browser, but >=IE10 is pretty decent.
IE10 might be good somewhere, but it sucks out loud on android, osx, ios and Linux (my preferred platforms). At best, its a niche product.