Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 595 insertions, 0 deletions

diff --git a/extensions/pref/autoconfig/test/marionette/autoconfig.cfg b/extensions/pref/autoconfig/test/marionette/autoconfig.cfg
new file mode 100644
index 0000000000..1e6fde18bf
--- /dev/null
+++ b/extensions/pref/autoconfig/test/marionette/autoconfig.cfg
@@ -0,0 +1,18 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+
+// Verify this one has a user value
+pref("_autoconfig_.test.userpref", "userpref");
+
+// Verify this one has a default pref
+defaultPref("_autoconfig_.test.defaultpref", "defaultpref");
+
+// Verify this one is locked
+lockPref("_autoconfig_.test.lockpref", "lockpref");
+
+lockPref("_autoconfig_.test.unlockpref", "unlockpref");
+// Verify this one is unlocked
+unlockPref("_autoconfig_.test.unlockpref");
+
+pref("_autoconfig_.test.clearpref", "clearpref");
+// Verify this one has no value
+clearPref("_autoconfig_.test.clearpref");
diff --git a/extensions/pref/autoconfig/test/marionette/autoconfig.js b/extensions/pref/autoconfig/test/marionette/autoconfig.js
new file mode 100644
index 0000000000..c891c5d108
--- /dev/null
+++ b/extensions/pref/autoconfig/test/marionette/autoconfig.js
@@ -0,0 +1,5 @@
+/* global pref */
+pref("general.config.sandbox_enabled", true);
+pref("general.config.filename", "autoconfig.cfg");
+pref("general.config.vendor", "autoconfig");
+pref("general.config.obscure_value", 0);
diff --git a/extensions/pref/autoconfig/test/marionette/manifest.ini b/extensions/pref/autoconfig/test/marionette/manifest.ini
new file mode 100644
index 0000000000..c10c20c2ae
--- /dev/null
+++ b/extensions/pref/autoconfig/test/marionette/manifest.ini
@@ -0,0 +1 @@
+[test_autoconfig.py]

diff --git a/extensions/pref/autoconfig/test/marionette/test_autoconfig.py b/extensions/pref/autoconfig/test/marionette/test_autoconfig.py
new file mode 100644
index 0000000000..0cdc0feede
--- /dev/null
+++ b/extensions/pref/autoconfig/test/marionette/test_autoconfig.py
@@ -0,0 +1,101 @@
+# 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/.
+
+import os
+import shutil
+
+from marionette_harness import MarionetteTestCase
+
+
+class TestAutoConfig(MarionetteTestCase):
+    def tearDown(self):
+        self.marionette.quit(in_app=False, clean=True)
+
+        if hasattr(self, "pref_file"):
+            os.remove(self.pref_file)
+        if hasattr(self, "autoconfig_file"):
+            os.remove(self.autoconfig_file)
+
+        super(TestAutoConfig, self).tearDown()
+
+    def pref_has_user_value(self, pref):
+        with self.marionette.using_context("chrome"):
+            return self.marionette.execute_script(
+                """
+                return Services.prefs.prefHasUserValue(arguments[0]);
+                """,
+                script_args=(pref,),
+            )
+
+    def pref_is_locked(self, pref):
+        with self.marionette.using_context("chrome"):
+            return self.marionette.execute_script(
+                """
+                return Services.prefs.prefIsLocked(arguments[0]);
+                """,
+                script_args=(pref,),
+            )
+
+    def test_autoconfig(self):
+        with self.marionette.using_context("chrome"):
+            self.exe_dir = self.marionette.execute_script(
+                """
+              return Services.dirsvc.get("GreD", Ci.nsIFile).path;
+            """
+            )
+
+        self.marionette.quit()
+
+        test_dir = os.path.dirname(__file__)
+        self.pref_file = os.path.join(self.exe_dir, "defaults", "pref", "autoconfig.js")
+        shutil.copyfile(os.path.join(test_dir, "autoconfig.js"), self.pref_file)
+        self.autoconfig_file = os.path.join(self.exe_dir, "autoconfig.cfg")
+        shutil.copyfile(os.path.join(test_dir, "autoconfig.cfg"), self.autoconfig_file)
+
+        self.marionette.start_session()
+
+        with self.marionette.using_context("chrome"):
+            self.assertTrue(
+                self.pref_has_user_value("_autoconfig_.test.userpref"),
+                "Pref should have user value",
+            )
+
+            self.assertEqual(
+                self.marionette.get_pref("_autoconfig_.test.userpref"),
+                "userpref",
+                "User pref should be set",
+            )
+
+            self.assertEqual(
+                self.marionette.get_pref("_autoconfig_.test.defaultpref", True),
+                "defaultpref",
+                "Default pref should be set",
+            )
+
+            self.assertTrue(
+                self.pref_is_locked("_autoconfig_.test.lockpref"),
+                "Pref should be locked",
+            )
+
+            self.assertEqual(
+                self.marionette.get_pref("_autoconfig_.test.lockpref"),
+                "lockpref",
+                "Locked pref should be set",
+            )
+
+            self.assertFalse(
+                self.pref_is_locked("_autoconfig_.test.unlockpref"),
+                "Pref should be unlocked",
+            )
+
+            self.assertEqual(
+                self.marionette.get_pref("_autoconfig_.test.unlockpref"),
+                "unlockpref",
+                "Unlocked pref should be set",
+            )
+
+            self.assertFalse(
+                self.pref_has_user_value("_autoconfig_.test.clearpref"),
+                "Pref should be cleared",
+            )
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-all.cfg b/extensions/pref/autoconfig/test/unit/autoconfig-all.cfg
new file mode 100644
index 0000000000..f636c3ec22
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-all.cfg
@@ -0,0 +1,31 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+
+// Verify this one has a user value
+pref("_autoconfig_.test.userpref", "userpref");
+
+// Verify this one has a default pref
+defaultPref("_autoconfig_.test.defaultpref", "defaultpref");
+
+// Verify this one is locked
+lockPref("_autoconfig_.test.lockpref", "lockpref");
+
+lockPref("_autoconfig_.test.unlockpref", "unlockpref");
+// Verify this one is unlocked
+unlockPref("_autoconfig_.test.unlockpref");
+
+pref("_autoconfig_.test.clearpref", "clearpref");
+// Verify this one has no value
+clearPref("_autoconfig_.test.clearpref");
+
+// Verify this one is set to the correct value
+pref("_autoconfig_.test.getpref.query", "getpref");
+pref("_autoconfig_.test.getpref", getPref("_autoconfig_.test.getpref.query"));
+
+// Verify this one is set to the correct value
+pref("_autoconfig_.test.getenv", getenv("AUTOCONFIG_TEST_GETENV"));
+
+// Since we can't test displayError directly, verify that it
+// exists and is a function
+pref("_autoconfig_.test.displayerror", typeof(displayError));
+
+// We are not getPrefBranch because it is being removed
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-chromecheck.cfg b/extensions/pref/autoconfig/test/unit/autoconfig-chromecheck.cfg
new file mode 100644
index 0000000000..2af6cfc109
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-chromecheck.cfg
@@ -0,0 +1,5 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+
+lockPref("_test.string.typeofComponents", typeof Components);
+lockPref("_test.string.typeofChromeUtils", typeof ChromeUtils);
+lockPref("_test.string.typeofServices", typeof Services);
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-latin1.cfg b/extensions/pref/autoconfig/test/unit/autoconfig-latin1.cfg
new file mode 100644
index 0000000000..6b96c65fd0
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-latin1.cfg
@@ -0,0 +1,6 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+// ©
+lockPref("_test.string.ASCII", "ASCII");
+lockPref("_test.string.non-ASCII", "日本語");
+lockPref("_test.string.getPref", getPref("_test.string.non-ASCII"));
+lockPref("_test.string.gIsUTF8", String(this.gIsUTF8));
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-no-sandbox-check.cfg b/extensions/pref/autoconfig/test/unit/autoconfig-no-sandbox-check.cfg
new file mode 100644
index 0000000000..a39080562f
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-no-sandbox-check.cfg
@@ -0,0 +1,5 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+
+lockPref("_test.typeof_Components", typeof Components);
+lockPref("_test.typeof_ChromeUtils", typeof ChromeUtils);
+lockPref("_test.typeof_Services", typeof Services);
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-no-sandbox.js b/extensions/pref/autoconfig/test/unit/autoconfig-no-sandbox.js
new file mode 100644
index 0000000000..a53b53dfb6
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-no-sandbox.js
@@ -0,0 +1,5 @@
+/* global pref */
+pref("general.config.sandbox_enabled", false);
+pref("general.config.filename", "autoconfig.cfg");
+pref("general.config.vendor", "autoconfig");
+pref("general.config.obscure_value", 0);
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-snap.cfg b/extensions/pref/autoconfig/test/unit/autoconfig-snap.cfg
new file mode 100644
index 0000000000..c5c67bfbb7
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-snap.cfg
@@ -0,0 +1,4 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+
+// Verify this one has a user value
+pref("_autoconfig_.test.userpref-snap", "userpref-snap");
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig-utf8.cfg b/extensions/pref/autoconfig/test/unit/autoconfig-utf8.cfg
new file mode 100644
index 0000000000..eec7899420
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig-utf8.cfg
@@ -0,0 +1,6 @@
+// # don't remove this comment! (the first line is ignored by Mozilla)
+
+lockPref("_test.string.ASCII", "UTF-8");
+lockPref("_test.string.non-ASCII", "日本語");
+lockPref("_test.string.getPref", getPref("_test.string.non-ASCII"));
+lockPref("_test.string.gIsUTF8", String(this.gIsUTF8));
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig.js b/extensions/pref/autoconfig/test/unit/autoconfig.js
new file mode 100644
index 0000000000..c891c5d108
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig.js
@@ -0,0 +1,5 @@
+/* global pref */
+pref("general.config.sandbox_enabled", true);
+pref("general.config.filename", "autoconfig.cfg");
+pref("general.config.vendor", "autoconfig");
+pref("general.config.obscure_value", 0);
diff --git a/extensions/pref/autoconfig/test/unit/autoconfig_snap.js b/extensions/pref/autoconfig/test/unit/autoconfig_snap.js
new file mode 100644
index 0000000000..bfa1df4859
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/autoconfig_snap.js
@@ -0,0 +1,5 @@
+/* global pref */
+pref("general.config.sandbox_enabled", true);
+pref("general.config.filename", "autoconfig-snap.cfg");
+pref("general.config.vendor", "autoconfig-snap");
+pref("general.config.obscure_value", 0);
diff --git a/extensions/pref/autoconfig/test/unit/test_autoconfig.js b/extensions/pref/autoconfig/test/unit/test_autoconfig.js
new file mode 100644
index 0000000000..60284c4544
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/test_autoconfig.js
@@ -0,0 +1,83 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint no-unsafe-finally: "off"*/
+/* Turning off this rule to allow control flow operations in finally block
+ * http://eslint.org/docs/rules/no-unsafe-finally  */
+
+function run_test() {
+  let prefs = Services.prefs.getBranch(null);
+  let defPrefs = Services.prefs.getDefaultBranch(null);
+
+  let greD = Services.dirsvc.get("GreD", Ci.nsIFile);
+  let defaultPrefD = Services.dirsvc.get("PrfDef", Ci.nsIFile);
+  let testDir = do_get_cwd();
+
+  try {
+    let autoConfigJS = testDir.clone();
+    autoConfigJS.append("autoconfig.js");
+    autoConfigJS.copyTo(defaultPrefD, "autoconfig.js");
+
+    // Make sure nsReadConfig is initialized.
+    Cc["@mozilla.org/readconfig;1"].getService(Ci.nsISupports);
+    Services.prefs.resetPrefs();
+
+    let autoConfigCfg = testDir.clone();
+    autoConfigCfg.append("autoconfig-all.cfg");
+    autoConfigCfg.copyTo(greD, "autoconfig.cfg");
+
+    Services.env.set("AUTOCONFIG_TEST_GETENV", "getenv");
+
+    Services.obs.notifyObservers(
+      Services.prefs,
+      "prefservice:before-read-userprefs"
+    );
+
+    ok(prefs.prefHasUserValue("_autoconfig_.test.userpref"));
+    equal("userpref", prefs.getStringPref("_autoconfig_.test.userpref"));
+
+    equal(
+      "defaultpref",
+      defPrefs.getStringPref("_autoconfig_.test.defaultpref")
+    );
+    equal("defaultpref", prefs.getStringPref("_autoconfig_.test.defaultpref"));
+
+    ok(prefs.prefIsLocked("_autoconfig_.test.lockpref"));
+    equal("lockpref", prefs.getStringPref("_autoconfig_.test.lockpref"));
+
+    ok(!prefs.prefIsLocked("_autoconfig_.test.unlockpref"));
+    equal("unlockpref", prefs.getStringPref("_autoconfig_.test.unlockpref"));
+
+    ok(!prefs.prefHasUserValue("_autoconfig_.test.clearpref"));
+
+    equal("getpref", prefs.getStringPref("_autoconfig_.test.getpref"));
+
+    equal("getenv", prefs.getStringPref("_autoconfig_.test.getenv"));
+
+    equal("function", prefs.getStringPref("_autoconfig_.test.displayerror"));
+
+    Services.prefs.resetPrefs();
+  } finally {
+    try {
+      let autoConfigJS = defaultPrefD.clone();
+      autoConfigJS.append("autoconfig.js");
+      autoConfigJS.remove(false);
+    } catch (e) {
+      if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw e;
+      }
+    }
+
+    try {
+      let autoConfigCfg = greD.clone();
+      autoConfigCfg.append("autoconfig.cfg");
+      autoConfigCfg.remove(false);
+    } catch (e) {
+      if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw e;
+      }
+    }
+
+    Services.prefs.resetPrefs();
+  }
+}
diff --git a/extensions/pref/autoconfig/test/unit/test_autoconfig_custom_path.js b/extensions/pref/autoconfig/test/unit/test_autoconfig_custom_path.js
new file mode 100644
index 0000000000..abfa8881b9
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/test_autoconfig_custom_path.js
@@ -0,0 +1,22 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { updateAppInfo } = ChromeUtils.importESModule(
+  "resource://testing-common/AppInfo.sys.mjs"
+);
+
+function run_test() {
+  let testDirName = do_get_cwd().clone();
+  Services.env.set("MOZ_SYSTEM_CONFIG_DIR", testDirName.path);
+
+  updateAppInfo();
+
+  try {
+    Services.dirsvc.undefine("SysConfD");
+  } catch (e) {}
+  let customSysConfD = Services.dirsvc.get("SysConfD", Ci.nsIFile);
+  let parent = customSysConfD.parent;
+  let child = customSysConfD.leafName;
+  notEqual("/etc", parent.path, "SysConfD is not in /etc");
+  equal("xpcshell", child, "SysConfD is xpcshell");
+}
diff --git a/extensions/pref/autoconfig/test/unit/test_autoconfig_default_path.js b/extensions/pref/autoconfig/test/unit/test_autoconfig_default_path.js
new file mode 100644
index 0000000000..20d3801ab1
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/test_autoconfig_default_path.js
@@ -0,0 +1,16 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { updateAppInfo } = ChromeUtils.importESModule(
+  "resource://testing-common/AppInfo.sys.mjs"
+);
+
+function run_test() {
+  updateAppInfo();
+
+  try {
+    Services.dirsvc.undefine("SysConfD");
+  } catch (e) {}
+  let defaultSysConfD = Services.dirsvc.get("SysConfD", Ci.nsIFile);
+  equal("/etc/xpcshell", defaultSysConfD.path, "SysConfD is in /etc");
+}
diff --git a/extensions/pref/autoconfig/test/unit/test_autoconfig_no_sandbox.js b/extensions/pref/autoconfig/test/unit/test_autoconfig_no_sandbox.js
new file mode 100644
index 0000000000..7553432bc0
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/test_autoconfig_no_sandbox.js
@@ -0,0 +1,59 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint no-unsafe-finally: "off"*/
+
+function run_test() {
+  let prefs = Services.prefs.getBranch(null);
+
+  let greD = Services.dirsvc.get("GreD", Ci.nsIFile);
+  let defaultPrefD = Services.dirsvc.get("PrfDef", Ci.nsIFile);
+  let testDir = do_get_cwd();
+
+  try {
+    let autoConfigJS = testDir.clone();
+    autoConfigJS.append("autoconfig-no-sandbox.js");
+    autoConfigJS.copyTo(defaultPrefD, "autoconfig.js");
+
+    // Make sure nsReadConfig is initialized.
+    Cc["@mozilla.org/readconfig;1"].getService(Ci.nsISupports);
+    Services.prefs.resetPrefs();
+
+    let autoConfigCfg = testDir.clone();
+    autoConfigCfg.append("autoconfig-no-sandbox-check.cfg");
+    autoConfigCfg.copyTo(greD, "autoconfig.cfg");
+
+    Services.obs.notifyObservers(
+      Services.prefs,
+      "prefservice:before-read-userprefs"
+    );
+
+    equal("object", prefs.getStringPref("_test.typeof_Components"));
+    equal("object", prefs.getStringPref("_test.typeof_ChromeUtils"));
+    equal("object", prefs.getStringPref("_test.typeof_Services"));
+
+    Services.prefs.resetPrefs();
+  } finally {
+    try {
+      let autoConfigJS = defaultPrefD.clone();
+      autoConfigJS.append("autoconfig.js");
+      autoConfigJS.remove(false);
+    } catch (e) {
+      if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw e;
+      }
+    }
+
+    try {
+      let autoConfigCfg = greD.clone();
+      autoConfigCfg.append("autoconfig.cfg");
+      autoConfigCfg.remove(false);
+    } catch (e) {
+      if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw e;
+      }
+    }
+
+    Services.prefs.resetPrefs();
+  }
+}
diff --git a/extensions/pref/autoconfig/test/unit/test_autoconfig_nonascii.js b/extensions/pref/autoconfig/test/unit/test_autoconfig_nonascii.js
new file mode 100644
index 0000000000..e535469360
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/test_autoconfig_nonascii.js
@@ -0,0 +1,110 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint no-unsafe-finally: "off"*/
+/* Turning off this rule to allow control flow operations in finally block
+ * http://eslint.org/docs/rules/no-unsafe-finally  */
+
+function run_test() {
+  let greD = Services.dirsvc.get("GreD", Ci.nsIFile);
+  let defaultPrefD = Services.dirsvc.get("PrfDef", Ci.nsIFile);
+  let testDir = do_get_cwd();
+
+  try {
+    let autoConfigJS = testDir.clone();
+    autoConfigJS.append("autoconfig.js");
+    autoConfigJS.copyTo(defaultPrefD, "autoconfig.js");
+
+    // Make sure nsReadConfig is initialized.
+    Cc["@mozilla.org/readconfig;1"].getService(Ci.nsISupports);
+    Services.prefs.resetPrefs();
+
+    var tests = [
+      {
+        filename: "autoconfig-utf8.cfg",
+        prefs: {
+          "_test.string.ASCII": "UTF-8",
+          "_test.string.non-ASCII": "日本語",
+          "_test.string.getPref": "日本語",
+          "_test.string.gIsUTF8": "true",
+        },
+      },
+      {
+        filename: "autoconfig-latin1.cfg",
+        prefs: {
+          "_test.string.ASCII": "ASCII",
+          "_test.string.non-ASCII": "日本語",
+          "_test.string.getPref": "日本語",
+          "_test.string.gIsUTF8": "false",
+        },
+      },
+      {
+        filename: "autoconfig-chromecheck.cfg",
+        prefs: {
+          "_test.string.typeofComponents": "undefined",
+          "_test.string.typeofChromeUtils": "undefined",
+          "_test.string.typeofServices": "undefined",
+        },
+      },
+    ];
+
+    function testAutoConfig(test) {
+      // Make sure pref values are unset.
+      for (let prefName in test.prefs) {
+        Assert.equal(
+          Ci.nsIPrefBranch.PREF_INVALID,
+          Services.prefs.getPrefType(prefName)
+        );
+      }
+
+      let autoConfigCfg = testDir.clone();
+      autoConfigCfg.append(test.filename);
+      autoConfigCfg.copyTo(greD, "autoconfig.cfg");
+
+      Services.obs.notifyObservers(
+        Services.prefs,
+        "prefservice:before-read-userprefs"
+      );
+
+      for (let prefName in test.prefs) {
+        Assert.equal(
+          test.prefs[prefName],
+          Services.prefs.getStringPref(prefName)
+        );
+      }
+
+      Services.prefs.resetPrefs();
+      // Make sure pref values are reset.
+      for (let prefName in test.prefs) {
+        Assert.equal(
+          Ci.nsIPrefBranch.PREF_INVALID,
+          Services.prefs.getPrefType(prefName)
+        );
+      }
+    }
+
+    tests.forEach(testAutoConfig);
+  } finally {
+    try {
+      let autoConfigJS = defaultPrefD.clone();
+      autoConfigJS.append("autoconfig.js");
+      autoConfigJS.remove(false);
+    } catch (e) {
+      if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw e;
+      }
+    }
+
+    try {
+      let autoConfigCfg = greD.clone();
+      autoConfigCfg.append("autoconfig.cfg");
+      autoConfigCfg.remove(false);
+    } catch (e) {
+      if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+        throw e;
+      }
+    }
+
+    Services.prefs.resetPrefs();
+  }
+}
diff --git a/extensions/pref/autoconfig/test/unit/test_autoconfig_snap.js b/extensions/pref/autoconfig/test/unit/test_autoconfig_snap.js
new file mode 100644
index 0000000000..1a58e11cf5
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/test_autoconfig_snap.js
@@ -0,0 +1,77 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* eslint no-unsafe-finally: "off"*/
+/* Turning off this rule to allow control flow operations in finally block
+ * http://eslint.org/docs/rules/no-unsafe-finally  */
+
+const { updateAppInfo } = ChromeUtils.importESModule(
+  "resource://testing-common/AppInfo.sys.mjs"
+);
+
+function ensureRemove(file) {
+  try {
+    file.remove(false);
+  } catch (e) {
+    if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
+      throw e;
+    }
+  }
+}
+
+async function run_test() {
+  let prefs = Services.prefs.getBranch(null);
+
+  let testDir = do_get_cwd();
+  let confDir = testDir.clone();
+  confDir.append("MozSystemConfigDir");
+  Services.env.set("MOZ_SYSTEM_CONFIG_DIR", confDir.path);
+  Services.env.set("SNAP_INSTANCE_NAME", "xpcshell");
+
+  updateAppInfo();
+
+  let sysConfD = Services.dirsvc.get("SysConfD", Ci.nsIFile);
+
+  let defaultPrefDExtra = sysConfD.clone();
+  defaultPrefDExtra.append("defaults");
+  defaultPrefDExtra.append("pref");
+
+  await IOUtils.makeDirectory(defaultPrefDExtra.path);
+
+  const kAutoConfigFile = defaultPrefDExtra.clone();
+  kAutoConfigFile.append("autoconfig_snap.js");
+  const kAutoConfigCfg = sysConfD.clone();
+  kAutoConfigCfg.append("autoconfig-snap.cfg");
+
+  let autoConfigJS = testDir.clone();
+  autoConfigJS.append(kAutoConfigFile.leafName);
+
+  let autoConfigCfg = testDir.clone();
+  autoConfigCfg.append(kAutoConfigCfg.leafName);
+
+  try {
+    autoConfigJS.copyTo(kAutoConfigFile.parent, kAutoConfigFile.leafName);
+    autoConfigCfg.copyTo(kAutoConfigCfg.parent, kAutoConfigCfg.leafName);
+
+    // Make sure nsReadConfig is initialized.
+    Cc["@mozilla.org/readconfig;1"].getService(Ci.nsISupports);
+    Services.prefs.resetPrefs();
+
+    Services.obs.notifyObservers(
+      Services.prefs,
+      "prefservice:before-read-userprefs"
+    );
+
+    ok(prefs.prefHasUserValue("_autoconfig_.test.userpref-snap"));
+    equal(
+      "userpref-snap",
+      prefs.getStringPref("_autoconfig_.test.userpref-snap")
+    );
+
+    Services.prefs.resetPrefs();
+  } finally {
+    ensureRemove(kAutoConfigFile);
+    ensureRemove(kAutoConfigCfg);
+    Services.prefs.resetPrefs();
+  }
+}
diff --git a/extensions/pref/autoconfig/test/unit/xpcshell.ini b/extensions/pref/autoconfig/test/unit/xpcshell.ini
new file mode 100644
index 0000000000..fd09da01af
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/xpcshell.ini
@@ -0,0 +1,23 @@
+[DEFAULT]
+head =
+skip-if =
+  toolkit == 'android'
+  os == 'win' && msix # Does not work in MSIX builds.
+support-files =
+  autoconfig-all.cfg
+  autoconfig-latin1.cfg
+  autoconfig-utf8.cfg
+  autoconfig-chromecheck.cfg
+  autoconfig-no-sandbox-check.cfg
+  autoconfig.js
+  autoconfig-no-sandbox.js
+
+[test_autoconfig.js]
+[test_autoconfig_nonascii.js]
+run-sequentially = very high failure rate in parallel
+[test_autoconfig_no_sandbox.js]
+run-sequentially = very high failure rate in parallel
+[test_autoconfig_default_path.js]
+run-if = os == 'linux'
+[test_autoconfig_custom_path.js]
+run-if = os == 'linux'
diff --git a/extensions/pref/autoconfig/test/unit/xpcshell_snap.ini b/extensions/pref/autoconfig/test/unit/xpcshell_snap.ini
new file mode 100644
index 0000000000..ff24d46646
--- /dev/null
+++ b/extensions/pref/autoconfig/test/unit/xpcshell_snap.ini
@@ -0,0 +1,8 @@
+[DEFAULT]
+head =
+skip-if = os != 'linux'
+
+[test_autoconfig_snap.js]
+support-files =
+  autoconfig_snap.js
+  autoconfig-snap.cfg