--- a/gfx/gl/GLContext.cpp
+++ b/gfx/gl/GLContext.cpp
@@ -100,16 +100,17 @@ static const char *const sExtensionNames
     "GL_ARB_robustness",
     "GL_ARB_sampler_objects",
     "GL_ARB_seamless_cube_map",
     "GL_ARB_sync",
     "GL_ARB_texture_compression",
     "GL_ARB_texture_float",
     "GL_ARB_texture_non_power_of_two",
     "GL_ARB_texture_rectangle",
+    "GL_ARB_texture_rg",
     "GL_ARB_texture_storage",
     "GL_ARB_texture_swizzle",
     "GL_ARB_timer_query",
     "GL_ARB_transform_feedback2",
     "GL_ARB_uniform_buffer_object",
     "GL_ARB_vertex_array_object",
     "GL_EXT_bgra",
     "GL_EXT_blend_minmax",

--- a/gfx/gl/GLContext.h
+++ b/gfx/gl/GLContext.h
@@ -133,16 +133,17 @@ enum class GLFeature {
     texture_3D,
     texture_3D_compressed,
     texture_3D_copy,
     texture_float,
     texture_float_linear,
     texture_half_float,
     texture_half_float_linear,
     texture_non_power_of_two,
+    texture_rg,
     texture_storage,
     texture_swizzle,
     transform_feedback2,
     uniform_buffer_object,
     uniform_matrix_nonsquare,
     vertex_array_object,
     EnumMax
 };
@@ -422,16 +423,17 @@ public:
         ARB_robustness,
         ARB_sampler_objects,
         ARB_seamless_cube_map,
         ARB_sync,
         ARB_texture_compression,
         ARB_texture_float,
         ARB_texture_non_power_of_two,
         ARB_texture_rectangle,
+        ARB_texture_rg,
         ARB_texture_storage,
         ARB_texture_swizzle,
         ARB_timer_query,
         ARB_transform_feedback2,
         ARB_uniform_buffer_object,
         ARB_vertex_array_object,
         EXT_bgra,
         EXT_blend_minmax,

--- a/gfx/gl/GLContextFeatures.cpp
+++ b/gfx/gl/GLContextFeatures.cpp
@@ -686,16 +686,25 @@ static const FeatureInfo sFeatureInfoArr
         GLContext::Extension_None,
         {
             GLContext::ARB_texture_non_power_of_two,
             GLContext::OES_texture_npot,
             GLContext::Extensions_End
         }
     },
     {
+        "texture_rg",
+        GLVersion::GL3,
+        GLESVersion::ES3,
+        GLContext::ARB_texture_rg,
+        {
+            GLContext::Extensions_End
+        }
+    },
+    {
         "texture_storage",
         GLVersion::GL4_2,
         GLESVersion::ES3,
         GLContext::ARB_texture_storage,
         {
             /*
              * Not including GL_EXT_texture_storage here because it
              * doesn't guarantee glTexStorage3D, which is required for

--- a/gfx/gl/SkiaGLGlue.cpp
+++ b/gfx/gl/SkiaGLGlue.cpp
@@ -366,16 +366,20 @@ const GLubyte* glGetString_mozilla(GrGLe
                     strcat(extensionsString, "GL_OES_standard_derivatives ");
                 }
             } else {
                 if (sGLContext.get()->IsSupported(GLFeature::framebuffer_object)) {
                     strcat(extensionsString, "GL_ARB_framebuffer_object ");
                 } else if (sGLContext.get()->IsExtensionSupported(GLContext::EXT_framebuffer_object)) {
                     strcat(extensionsString, "GL_EXT_framebuffer_object ");
                 }
+
+                if (sGLContext.get()->IsSupported(GLFeature::texture_rg)) {
+                    strcat(extensionsString, "GL_ARB_texture_rg ");
+                }
             }
 
             if (sGLContext.get()->IsExtensionSupported(GLContext::EXT_texture_format_BGRA8888)) {
                 strcat(extensionsString, "GL_EXT_texture_format_BGRA8888 ");
             }
 
             if (sGLContext.get()->IsExtensionSupported(GLContext::EXT_packed_depth_stencil)) {
                 strcat(extensionsString, "GL_EXT_packed_depth_stencil ");