GL_EXT_draw_buffers not supported

[MagicPockets-EZ]

Hi,
trying to use MRT technic into a webgl game, I see that GL_EXT_draw_buffers is not supported in your inspector and generate an error as soon as I run it and only when I run it.

here is the shader and the error reported:

001 // SHADER_DEFAULT SF_TEX0 SF_SKIN_B1 SF_LOWQ
002 #extension GL_EXT_draw_buffers : require
003 precision mediump float;
004 uniform vec4 u_matColor[5];
005 uniform float u_reflexion;
006 uniform vec4 u_info;
007 uniform sampler2D u_tex0;
008 uniform highp sampler2D u_tex1;
009 uniform sampler2D u_tex2;
010 uniform sampler2D u_tex3;
011 varying lowp vec4 v_color;
012 varying vec4 v_texCoord0;
013 varying vec2 v_texCoord1;
014 vec4 c0, c1, c2;
015 void main()
016 {
017 c0 = texture2D(u_tex0, v_texCoord0.xy);
018 c0 *= v_color;
019 gl_FragData[0] = c0;

020 }

ERROR: 0:2: 'GL_EXT_draw_buffers' : extension is not supported

[MagicPockets-EZ]

VAO doesn't work too.
This is a shame because it is precisely what I was looking to debugger on my side!