Starfall | Full example, showing how to enable unrestricted clientside access to vgui library for the specific Starfall chip

clientside-hack.lua

--[[
    0. Assuming you can run clientside Lua (sv_allowcslua 1).
    1. Spawn this code as a Starfall chip.
    2. Aim on the Starfall chip!
    3. Open ingame developer console (by default, press tilde key) and submit the following:
       lua_run_cl LocalPlayer():GetEyeTrace().Entity.instance.env.vgui = _G.vgui
    4. The above command will give unrestricted access to vgui library to the Starfall chip.
    5. Be sure you trust chip's owner *before* using the above hack command on other player's SF chip!!
]]

--@client
--@author Cheatoid

local function InitializeVGUI()
    -- Do your VGUI stuff here...
    local frame = vgui.Create("DFrame")
    frame:SetSize(800, 600)
    frame:SetTitle("HTML Example!")
    frame:Center()
    frame:MakePopup()

    local html = vgui.Create("DHTML", frame)
    html:Dock(1) -- FILL
    html:OpenURL("https://www.google.com/")
end

-- Boilerplate code to wait until vgui is available on clientside.
do
    local WaitForVGUI
    function WaitForVGUI(callback)
        if vgui then callback() else timer.simple(1.0, function() WaitForVGUI(callback) end) end
    end
    WaitForVGUI(InitializeVGUI)
end