Textual words from them:
It’s our first step towards a more modern, more beautiful, and more customizable Thunderbird experience. We think you’re going to love it, and we are endlessly grateful for all of your support throughout the years 💙
I was gonna say, I tried it a couple months ago and I’m pretty sure it hadn’t been changed since when I was using it in like 2012. I thought a theme might help so I checked out the available themes, and the “popular” ones were ones that felt like they were from back then too. Everyone remembers Firefox / Thunderbird themes from back then: frosted glass, photos of space, flames, lots of gradients, themes that look like wood for some reason, that gross red text on black-white gradient background. It was like the entire app was aesthetically trapped in the early 2010s, even the community’s themes.