Which is a shame as it's a really nice fork of Firefox. That picture doesn't do it justice, you can see the three row tab bar that expands only if'n there's enough tabs, nor the hide away bookmarks toolbar.
So why the thumbs down? Well, for starters it ate all my settings, I closed it, realized I'd forgotten to do something, reopened it, and default. If that were it, that wouldn't be so bad, but while installed Firefox wouldn't work, At first it was some minor glitchiness, but when I closed Floorp and went to use Firefox to research the problem and what the solution is, my three home tabs didn't open, and the one tab that didn't showed Tumblr but the browser displayed the Firefox new tab window, as did any other tabs I opened, it was completely unresponsive.
Really it's a shame, because Floorp is a really nice browser, and the customization is great, not just for eye candy, the vertical Thunderbird like toolbar gives easy access to things you need, the hide away ( like your taskbar can) bookmarks toolbar makes it easy to get to your bookmarks without them taking up space. Unfortunately, it's far too buggy to use.
I do wonder, how many of it's features are available in the config? While the vertical toolbar and built in syncable notes obviously aren't, what about hiding the bookmarks toolbar? Moving the toolbar and tab bar around? Multiple tab rows? Are their extensions to add some of this?
I have been running it for several weeks now and haven’t had any problems. I still use Firefox for things that don’t work well in a Flatpack environment, and Firefox works and syncs as expected. I don’t use a Start page or sync open tabs though.