I actually do really like the current logo, the purple is fun. That original one is wild though.

2019 is best. gradation is beautiful.

2005

I miss that semi-clipart style.

A couple logos more and the fox is gonna disappear entirely, only to be reborn (?)

2005 and 2009 for the clear detail, and 2017 for the simplification that still clearly conveys the logo.

The tail in 2009 is my favorite

2004 as it's original form, but 2019 is still really nice too. The logo has aged really well over the years.

2005 Has to be my go to. Based off of this we are due for a logo rework.

It's a choice between 2004 and 2019. As overdone as minimalist designs can be at times, I find the simple, fiery gradient in 2019 to be gorgeous, along with the smooth curves. A really detailed logo in this day and age would look a bit out of place. 2017 and 2019 go for a similar aesthetic, though I believe 2019 pulls it off better.

That being said, I still enjoy the look of 2004, and think it's the best from 2004-2013. I find the tail in 2005 to be a tad too yellow, and I don't like how the outer parts of the blue globe can be seen beneath the tail in 2009 and 2013. 2004 is just sublime.

Not sure what 2002 is doing, because that sure as hell aint a fox xD

2004 and 2013

I think 2017 hits the right sweetspot. Not too oversimplified (lookin at you, 2019) nor excessively realistic (2009 and before). Firefox and mozilla branding in genera looks fire (no pun intended) imo.

If you're interested in it: https://mozilla.design/ and https://acorn.firefox.com/latest/acorn.html

2005 looks best to me.

Current isn't the worst case of flat design on the web, but definitely 2005. Sad to see graphic design going backwards in detail.

2017

2004 ... best