guifont no effect

[GNUqb114514]

• OS Version: Arch Linux x86_64
• Browser Version: Firefox 132.0.1
• Browser Addon Version: 0.2.16
• Neovim Plugin Version: commit 64f9389

What I tried to do

Change guifont:

return {
    { 'glacambre/firenvim', build = ":call firenvim#install(0)",
        lazy = false,
        config = function ()
            if vim.g.started_by_firenvim then
                vim.o.laststatus=0
                vim.opt.guifont='UbuntuMono Nerd Font Mono'
            end
        end
    },
}

What happened

The guifont was set correctly, but the font stay unchanged:

P.S.

Here I'm fc-matching my font:

% fc-match "UbuntuMono Nerd Font Mono"
UbuntuMonoNerdFontMono-Regular.ttf: "UbuntuMono Nerd Font Mono" "Regular"

And its effect in Alacritty is:

[theherk]

Yeah, something is strange here. If I set the fonts manually and disable "Allow pages to choose their own fonts, instead of your selections above" I can set the font for instance. That isn't ideal though, because I just want to set the font of the neovim. I tried putting this in userContext.css.

textarea, textarea * {
  font-family: "VictorMono Nerd Font", "Victor Mono", monospace !important;
}

This does correctly set the font for the textarea, but this is not picked up by the instance of Neovim. Would be really nice to control the font in here.