- Open a new window: the tabs are not there by default - You need a css hack to hide the standard bar - There’s an ugly title thingy at the top of the tab pane

> Open a new window: the tabs are not there by default

It's not ideal but not a showstopper for me. I mostly use one window, where the toolbar is restored by default, and when I open a new window I got used to clicking the toolbar button (which I moved to the left) or pressing F1.

> You need a css hack to hide the standard bar

> There’s an ugly title thingy at the top of the tab pane

I just copied the "css hack" once and forgot. The last item is solved the same way. For those who don't know:

Inside the profile folder (with a name like "xxxxxxxx.default"), create a folder called "chrome", and a file inside called "userChrome.css" with the following content:

    #TabsToolbar, #sidebar-header {visibility: collapse !important;}
    #TabsToolbar {margin-bottom: -21px !important;}

IMHO It's quick enough to do and I believe this won't be needed in a few months.

Thanks! Here's how I did it on macOS:

1. Go to about:support in Firefox URL bar.

2. the address is in "Profile Folder" row.

Thanks! I didn't know that. It seems to be like that in other OSes too. I've tried to edit my previous comment but I was just over the time limit.

Brilliant! Thank you!

it's uber slow

What OS, CPU, etc? It's pretty fast to me.

MacOS Sierra, 3.1 Ghz Intel i7, 16GB of DDR3, SSD, ...

I have no idea why it's so slow.

It's uber slow for me too. Similar specs. Several hundred millisecond tab switches with a clean profile. Typing into slack is like typing into an SSH session over a bad dialup connection. Adding Tree Style Tabs kept my CPU over 20% and my fans running permanently. Maybe it's faster for people on Windows or Linux, but on macOS it's a major regression.