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diff --git a/layout/tools/reftest/globals.sys.mjs b/layout/tools/reftest/globals.sys.mjs
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index 0000000000..c5a01a9c76
--- /dev/null
+++ b/layout/tools/reftest/globals.sys.mjs
@@ -0,0 +1,157 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+export const globals = {
+  /* Constants */
+  XHTML_NS: "http://www.w3.org/1999/xhtml",
+  XUL_NS: "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul",
+
+  NS_GFXINFO_CONTRACTID: "@mozilla.org/gfx/info;1",
+  DEBUG_CONTRACTID: "@mozilla.org/xpcom/debug;1",
+
+  TYPE_REFTEST_EQUAL: "==",
+  TYPE_REFTEST_NOTEQUAL: "!=",
+  TYPE_LOAD: "load", // test without a reference (just test that it does
+  // not assert, crash, hang, or leak)
+  TYPE_SCRIPT: "script", // test contains individual test results
+  TYPE_PRINT: "print", // test and reference will be printed to PDF's and
+  // compared structurally
+
+  // keep this in sync with reftest-content.js
+  URL_TARGET_TYPE_TEST: 0, // first url
+  URL_TARGET_TYPE_REFERENCE: 1, // second url, if any
+
+  // The order of these constants matters, since when we have a status
+  // listed for a *manifest*, we combine the status with the status for
+  // the test by using the *larger*.
+  // FIXME: In the future, we may also want to use this rule for combining
+  // statuses that are on the same line (rather than making the last one
+  // win).
+  EXPECTED_PASS: 0,
+  EXPECTED_FAIL: 1,
+  EXPECTED_RANDOM: 2,
+  EXPECTED_FUZZY: 3,
+
+  // types of preference value we might want to set for a specific test
+  PREF_BOOLEAN: 0,
+  PREF_STRING: 1,
+  PREF_INTEGER: 2,
+
+  FOCUS_FILTER_ALL_TESTS: "all",
+  FOCUS_FILTER_NEEDS_FOCUS_TESTS: "needs-focus",
+  FOCUS_FILTER_NON_NEEDS_FOCUS_TESTS: "non-needs-focus",
+
+  // "<!--CLEAR-->"
+  BLANK_URL_FOR_CLEARING:
+    "data:text/html;charset=UTF-8,%3C%21%2D%2DCLEAR%2D%2D%3E",
+
+  /* Globals */
+  g: {
+    loadTimeout: 0,
+    timeoutHook: null,
+    remote: false,
+    ignoreWindowSize: false,
+    shuffle: false,
+    repeat: null,
+    runUntilFailure: false,
+    cleanupPendingCrashes: false,
+    totalChunks: 0,
+    thisChunk: 0,
+    containingWindow: null,
+    urlFilterRegex: {},
+    contentGfxInfo: null,
+    focusFilterMode: "all",
+    compareRetainedDisplayLists: false,
+    isCoverageBuild: false,
+
+    browser: undefined,
+    // Are we testing web content loaded in a separate process?
+    browserIsRemote: undefined, // bool
+    // Are we using <iframe mozbrowser>?
+    browserIsIframe: undefined, // bool
+    browserMessageManager: undefined, // bool
+    useDrawSnapshot: undefined, // bool
+    canvas1: undefined,
+    canvas2: undefined,
+    // gCurrentCanvas is non-null between InitCurrentCanvasWithSnapshot and the next
+    // RecordResult.
+    currentCanvas: null,
+    urls: undefined,
+    // Map from URI spec to the number of times it remains to be used
+    uriUseCounts: undefined,
+    // Map from URI spec to the canvas rendered for that URI
+    uriCanvases: undefined,
+    testResults: {
+      // Successful...
+      Pass: 0,
+      LoadOnly: 0,
+      // Unexpected...
+      Exception: 0,
+      FailedLoad: 0,
+      UnexpectedFail: 0,
+      UnexpectedPass: 0,
+      AssertionUnexpected: 0,
+      AssertionUnexpectedFixed: 0,
+      // Known problems...
+      KnownFail: 0,
+      AssertionKnown: 0,
+      Random: 0,
+      Skip: 0,
+      Slow: 0,
+    },
+    totalTests: 0,
+    currentURL: undefined,
+    currentURLTargetType: undefined,
+    testLog: [],
+    logLevel: undefined,
+    logFile: null,
+    logger: undefined,
+    server: undefined,
+    count: 0,
+    assertionCount: 0,
+
+    ioService: undefined,
+    debug: undefined,
+    windowUtils: undefined,
+
+    slowestTestTime: 0,
+    slowestTestURL: undefined,
+    failedUseWidgetLayers: false,
+
+    drawWindowFlags: undefined,
+
+    expectingProcessCrash: false,
+    expectedCrashDumpFiles: [],
+    unexpectedCrashDumpFiles: {},
+    crashDumpDir: undefined,
+    pendingCrashDumpDir: undefined,
+    failedNoPaint: false,
+    failedNoDisplayList: false,
+    failedDisplayList: false,
+    failedOpaqueLayer: false,
+    failedOpaqueLayerMessages: [],
+    failedAssignedLayer: false,
+    failedAssignedLayerMessages: [],
+
+    startAfter: undefined,
+    suiteStarted: false,
+    manageSuite: false,
+
+    prefsToRestore: [],
+    httpServerPort: -1,
+
+    // whether to run slow tests or not
+    runSlowTests: true,
+
+    // whether we should skip caching canvases
+    noCanvasCache: false,
+    recycledCanvases: [],
+    testPrintOutput: null,
+
+    manifestsLoaded: {},
+    // Only dump the sandbox once, because it doesn't depend on the
+    // manifest URL (yet!).
+    dumpedConditionSandbox: false,
+  },
+};