diff --git a/components/script/dom/webgl_extensions/ext/extshadertexturelod.rs b/components/script/dom/webgl_extensions/ext/extshadertexturelod.rs
index cb574b0fb50..ce3200db18b 100644
--- a/components/script/dom/webgl_extensions/ext/extshadertexturelod.rs
+++ b/components/script/dom/webgl_extensions/ext/extshadertexturelod.rs
@@ -37,7 +37,11 @@ impl WebGLExtension for EXTShaderTextureLod {
     }
 
     fn is_supported(ext: &WebGLExtensions) -> bool {
-        ext.supports_gl_extension("GL_EXT_shader_texture_lod")
+        if cfg!(any(target_os = "android", target_os = "ios")) {
+            return ext.supports_gl_extension("GL_EXT_shader_texture_lod");
+        }
+        // This extension is always available on desktop GL.
+        true
     }
 
     fn enable(_ext: &WebGLExtensions) {}
diff --git a/components/script/dom/webgl_extensions/extensions.rs b/components/script/dom/webgl_extensions/extensions.rs
index 33081e4bfe1..ca81e2d10e8 100644
--- a/components/script/dom/webgl_extensions/extensions.rs
+++ b/components/script/dom/webgl_extensions/extensions.rs
@@ -265,6 +265,7 @@ impl WebGLExtensions {
     }
 
     fn register_all_extensions(&self) {
+        self.register::<ext::extshadertexturelod::EXTShaderTextureLod>();
         self.register::<ext::exttexturefilteranisotropic::EXTTextureFilterAnisotropic>();
         self.register::<ext::oeselementindexuint::OESElementIndexUint>();
         self.register::<ext::oesstandardderivatives::OESStandardDerivatives>();
diff --git a/components/script/dom/webglshader.rs b/components/script/dom/webglshader.rs
index 2fa975939c0..0ec5c262803 100644
--- a/components/script/dom/webglshader.rs
+++ b/components/script/dom/webglshader.rs
@@ -12,6 +12,7 @@ use dom::bindings::reflector::reflect_dom_object;
 use dom::bindings::root::DomRoot;
 use dom::bindings::str::DOMString;
 use dom::webgl_extensions::WebGLExtensions;
+use dom::webgl_extensions::ext::extshadertexturelod::EXTShaderTextureLod;
 use dom::webgl_extensions::ext::oesstandardderivatives::OESStandardDerivatives;
 use dom::webglobject::WebGLObject;
 use dom::window::Window;
@@ -117,6 +118,7 @@ impl WebGLShader {
         let mut params = BuiltInResources::default();
         params.FragmentPrecisionHigh = 1;
         params.OES_standard_derivatives = ext.is_enabled::<OESStandardDerivatives>() as i32;
+        params.EXT_shader_texture_lod = ext.is_enabled::<EXTShaderTextureLod>() as i32;
         let validator = match webgl_version {
             WebGLVersion::WebGL1 => {
                 let output_format = if cfg!(any(target_os = "android", target_os = "ios")) {