It really is nice that we are being flattered so much and told how much we're loved from the bottom Mozilla's heart...
But I can't really see what is so great about this new tool. It looks like everything that is already available. It may have been updated so that it is on par with Google's dev tools but was a publicity stunt really needed in order to do this?
If you want to download the new edition you can get it straight from the Mozilla website. Download it and give it a try. It does seem to be well developed for mobile emulators.
Developers are critical to the continued success of the Web. The content and apps they create compel us to come back to the Web every day, whether on a computer or mobile phone. In celebration of the 10th anniversary of Firefox, we’re excited to unveil Firefox Developer Edition, the first browser created specifically for developers.