return {
  -- Some commands to remember when dealing with highlight-groups:
  -- :filter GroupPrefix highlight
  -- :put =execute('highlight')

  { -- https://github.com/catgoose/nvim-colorizer.lua
    "catgoose/nvim-colorizer.lua",
    cmd = "ColorizerToggle",
    opts = {
      options = {
        parsers = {
          custom = { -- parses color230 etc
            {
              name = "xterm_color_name",
              prefixes = { "color" },
              parse = function(ctx)
                local num = ctx.line:match("color(%d%d?%d?)", ctx.col)
                if not num then
                  return
                end

                local n = tonumber(num)
                if not n or n < 0 or n > 255 then
                  return
                end

                local len = #"color" + #num
                local next = ctx.line:sub(ctx.col + len, ctx.col + len)
                if next:match("[%w_]") then
                  return
                end

                local _, hex = require("colorizer.parser.xterm").parser("#x" .. num, 1)
                if hex then
                  return len, hex
                end
              end,
            },
          },
        },
      },
    },
    config = function(_, opts)
      require("colorizer").setup(opts)

      -- execute colorizer as soon as possible
      vim.defer_fn(function()
        require("colorizer").attach_to_buffer(0)
      end, 0)
    end,
  },
}