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diff --git a/dom/canvas/test/webgl-mochitest/ensure-exts/test_common.html b/dom/canvas/test/webgl-mochitest/ensure-exts/test_common.html
new file mode 100644
index 000000000..153161d93
--- /dev/null
+++ b/dom/canvas/test/webgl-mochitest/ensure-exts/test_common.html
@@ -0,0 +1,110 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset='utf-8'/>
+    <script src='/tests/SimpleTest/SimpleTest.js'></script>
+    <link rel='stylesheet' href='/tests/SimpleTest/test.css'>
+    <script src='ensure-ext.js'></script>
+  </head>
+  <body>
+    <script>
+
+'use strict';
+
+var ENSURE = 'ENSURE'; // Works on all test machines.
+var FORBID = 'FORBID'; // Should not work on any test machine.
+var MACHINE_SPECIFIC = 'MACHINE_SPECIFIC';
+
+var defaultExts = [
+    // Ratified
+    ['ANGLE_instanced_arrays'        , [MACHINE_SPECIFIC, FORBID          ]],
+    ['EXT_blend_minmax'              , [MACHINE_SPECIFIC, FORBID          ]],
+    ['EXT_disjoint_timer_query'      , [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+    ['EXT_frag_depth'                , [MACHINE_SPECIFIC, FORBID          ]],
+    ['EXT_shader_texture_lod'        , [MACHINE_SPECIFIC, FORBID          ]],
+    ['EXT_texture_filter_anisotropic', [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+    ['OES_element_index_uint'        , [ENSURE          , FORBID          ]],
+    ['OES_standard_derivatives'      , [MACHINE_SPECIFIC, FORBID          ]],
+    ['OES_texture_float'             , [ENSURE          , FORBID          ]],
+    ['OES_texture_float_linear'      , [ENSURE          , ENSURE          ]],
+    ['OES_texture_half_float'        , [ENSURE          , FORBID          ]],
+    ['OES_texture_half_float_linear' , [ENSURE          , FORBID          ]],
+    ['OES_vertex_array_object'       , [ENSURE          , FORBID          ]],
+    ['WEBGL_compressed_texture_s3tc' , [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+//  ['WEBGL_debug_renderer_info'     , [FORBID          , FORBID          ]], // Complicated!
+    ['WEBGL_debug_shaders'           , [FORBID          , FORBID          ]],
+    ['WEBGL_depth_texture'           , [MACHINE_SPECIFIC, FORBID          ]],
+    ['WEBGL_draw_buffers'            , [MACHINE_SPECIFIC, FORBID          ]],
+    ['WEBGL_lose_context'            , [ENSURE          , ENSURE          ]],
+
+    // Community Approved
+    ['EXT_color_buffer_float'        , [FORBID          , ENSURE          ]],
+    ['EXT_color_buffer_half_float'   , [MACHINE_SPECIFIC, FORBID          ]],
+    ['EXT_sRGB'                      , [MACHINE_SPECIFIC, FORBID          ]],
+    ['WEBGL_color_buffer_float'      , [MACHINE_SPECIFIC, FORBID          ]],
+    ['WEBGL_compressed_texture_atc'  , [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+    ['WEBGL_compressed_texture_etc1' , [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+    ['WEBGL_compressed_texture_pvrtc', [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+];
+
+var draftExts = [
+    ['WEBGL_compressed_texture_es3', [MACHINE_SPECIFIC, MACHINE_SPECIFIC]],
+];
+
+var nonImplementedExts = [
+    'OES_fbo_render_mipmap',
+    'WEBGL_compressed_texture_astc',
+    'WEBGL_security_sensitive_resources',
+    'WEBGL_shared_resources',
+];
+
+////////////////////
+
+function TestExtFor(contextType, extName, status) {
+    switch (status) {
+    case ENSURE:
+        EnsureExtFor(contextType, extName);
+        break;
+
+    case FORBID:
+        EnsureExtFor(contextType, extName, false);
+        break;
+
+    case MACHINE_SPECIFIC:
+        break;
+    }
+}
+
+function TestExt(extName, statusArr) {
+    TestExtFor('webgl', extName, statusArr[0]);
+    TestExtFor('webgl2', extName, statusArr[1]);
+}
+
+////////////////////
+
+defaultExts.forEach(function(x) {
+    var extName = x[0];
+    var statusArr = x[1];
+    TestExt(extName, statusArr);
+});
+
+nonImplementedExts.forEach(function(extName) {
+    EnsureExt(extName, false);
+});
+
+draftExts.forEach(function(x) {
+    var extName = x[0];
+    EnsureExt(extName, false);
+});
+
+Lastly_WithDraftExtsEnabled(function() {
+    draftExts.forEach(function(x) {
+        var extName = x[0];
+        var statusArr = x[1];
+        TestExt(extName, statusArr);
+    });
+});
+
+    </script>
+  </body>
+</html>