This "firefox" is actually a red panda which is a protected species in Asia. A mistake when translating red panda from Chinese to English is how we got firefox. The composition of the logo has not changed since 2004: a red panda encircling a blue globe representing the earth. Since it had been 15 years since Mozilla Firefox had had a major overhaul of its image, the company decided in 2018 to test the waters. They decided to show different options of their new design. They do not just want to change their main logo but also create a whole new family of icons consistent with the brand. This last point was Slack’s main argument during their redesign earlier this year.

Two designs have been shown to the public so far and they are very promising. Once again we find it a minimalist appearance with warm colors. We should know more about this redesign very soon, at least we hope!

UPDATE JUNE 13TH. 2019

The new logo has been revealed! The red panda and the Earth have disappeared and the final result is quite minimalistic.

Actually the above about the Firefox name going with icon is not quite correct.

https://www.quora.com/Why-is-Mozilla-Firefox-browser-named-as-Firefox

Firefox is named Firefox because Jason Kersey, an early contributor on the project, suggested the name during a re-naming brainstorming sessions in late 2003 at the first Mozilla office on Villa Street, in Mountain View, CA. It was the best one on our list and after a couple of quick trademark searches turned up nothing substantial and an image search turned up the adorable Red Panda (also called a Firefox) we decided to go with it

Jason Kersey is the owner/admin of the independent mozillaZine forums.

Anyways the Op was commenting about the new logo and not the history of the Firefox (third-one) for this web browser.