Grondinm sent the following directly to me so reproducing here so it's also
in the message thread:

Screenshots here https://imgur.com/a/jbImL
> So that command does seem to return the expected results. But as you can
> see if i set a theme from fish_config then open up a fresh xterm only the
> text colors have changed not the background.


Okay, the first thing to note is that most of those themes assume you have
a terminal that can display not only 256 colors but also supports 24bit
color escape sequences. Fish will mostly do the right thing if your TERM
name contains "256color"; e.g.,

set -x TERM xterm-256color

If you know your terminal emulator supports the ANSI X3.64 256 color
palette but there isn't an appropriate TERM name you can force fish to
enable 256 color support with

set -U fish_term256 1

The colors however may not exactly match what you see in the browser unless
you also

set -U fish_term24bit 1

That's because if the terminal only supports the 256 color palette fish
will map the 24bit color values to the closest equivalent color in that
palette. Of course don't do that if xfce-term doesn't support 24bit color
values (aka "true color" support).
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