I used Tree Style Tab but I didn’t like having to change the userChrome.css to make it streamlined (i.e. hiding the tab bar), while Pulse does it natively and really well. I do have an extension for tab groups that imitates Vivaldi’s tab workspaces though, not sure if those will conflict. (If you’re curious, it’s called Simple Tab Groups.)
Edit: There’s also the issue of Mozilla calling the editable userChrome.css a legacy feature, which kinda worries me about its possible removal. Pulse having vertical tabs as a native feature skips that.
I know it’s most likely not relevant with you anymore, since you’re using Pulse, but have you tried any of the vertical/tree tab extensions?
I used Tree Style Tab but I didn’t like having to change the
userChrome.cssto make it streamlined (i.e. hiding the tab bar), while Pulse does it natively and really well. I do have an extension for tab groups that imitates Vivaldi’s tab workspaces though, not sure if those will conflict. (If you’re curious, it’s called Simple Tab Groups.)Edit: There’s also the issue of Mozilla calling the editable userChrome.css a legacy feature, which kinda worries me about its possible removal. Pulse having vertical tabs as a native feature skips that.