diff --git a/security/sandbox/common/test/SandboxTestingChildTests.h b/security/sandbox/common/test/SandboxTestingChildTests.h
index a2901683f5c0..61ab0991f5e5 100644
--- a/security/sandbox/common/test/SandboxTestingChildTests.h
+++ b/security/sandbox/common/test/SandboxTestingChildTests.h
@@ -20,6 +20,7 @@
 #    include <sys/utsname.h>
 #    include <sched.h>
 #    include <sys/syscall.h>
+#    include <sys/un.h>
 #  endif  // XP_LINUX
 #  include <sys/socket.h>
 #  include <sys/stat.h>
@@ -46,7 +47,6 @@ void RunTestsContent(SandboxTestingChild* child) {
 #  ifdef XP_LINUX
   child->ErrnoTest("fstatat_as_fstat"_ns, true,
                    [&] { return fstatat(0, "", &st, AT_EMPTY_PATH); });
-#  endif  // XP_LINUX
 
   const struct timespec usec = {0, 1000};
   child->ErrnoTest("nanosleep"_ns, true,
@@ -56,6 +56,59 @@ void RunTestsContent(SandboxTestingChild* child) {
   child->ErrnoTest("clock_getres"_ns, true,
                    [&] { return clock_getres(CLOCK_REALTIME, &res); });
 
+  // An abstract socket that does not starts with '/', so we don't want it to
+  // work.
+  // Checking ENETUNREACH should be thrown by SandboxBrokerClient::Connect()
+  // when it detects it does not starts with a '/'
+  child->ErrnoValueTest("connect_abstract_blocked"_ns, false, ENETUNREACH, [&] {
+    int sockfd;
+    struct sockaddr_un addr;
+    char str[] = "\0xyz";  // Abstract socket requires first byte to be NULL
+    size_t str_size = 4;
+
+    memset(&addr, 0, sizeof(struct sockaddr_un));
+    addr.sun_family = AF_UNIX;
+    memcpy(&addr.sun_path, str, str_size);
+
+    sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (sockfd == -1) {
+      return -1;
+    }
+
+    int con_st = connect(sockfd, (struct sockaddr*)&addr,
+                         sizeof(sa_family_t) + str_size);
+    return con_st;
+  });
+
+  // An abstract socket that does starts with /, so we do want it to work.
+  // Checking ECONNREFUSED because this is what the broker should get when
+  // trying to establish the connect call for us.
+  child->ErrnoValueTest("connect_abstract_permit"_ns, false, ECONNREFUSED, [&] {
+    int sockfd;
+    struct sockaddr_un addr;
+    // we re-use actual X path, because this is what is allowed within
+    // SandboxBrokerPolicyFactory::InitContentPolicy()
+    // We can't just use any random path allowed, but one with CONNECT allowed.
+
+    // Abstract socket requires first byte to be NULL
+    char str[] = "\0/tmp/.X11-unix/X";
+    size_t str_size = 17;
+
+    memset(&addr, 0, sizeof(struct sockaddr_un));
+    addr.sun_family = AF_UNIX;
+    memcpy(&addr.sun_path, str, str_size);
+
+    sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (sockfd == -1) {
+      return -1;
+    }
+
+    int con_st = connect(sockfd, (struct sockaddr*)&addr,
+                         sizeof(sa_family_t) + str_size);
+    return con_st;
+  });
+#  endif  // XP_LINUX
+
 #else   // XP_UNIX
   child->ReportNoTests();
 #endif  // XP_UNIX
diff --git a/security/sandbox/test/browser.ini b/security/sandbox/test/browser.ini
index 028046bd1106..5362cfe86100 100644
--- a/security/sandbox/test/browser.ini
+++ b/security/sandbox/test/browser.ini
@@ -21,4 +21,6 @@ support-files =
 skip-if = (os != 'mac') # This is a Mac-specific test
 
 [browser_sandbox_test.js]
-skip-if = !debug
+skip-if =
+  (debug && os == 'win') # bug 1718210
+  !debug
diff --git a/security/sandbox/test/browser_sandbox_test.js b/security/sandbox/test/browser_sandbox_test.js
index 55af8b12ae3e..f1583563e9d9 100644
--- a/security/sandbox/test/browser_sandbox_test.js
+++ b/security/sandbox/test/browser_sandbox_test.js
@@ -14,6 +14,10 @@ function test() {
   // GPU process might not run depending on the platform, so we need it to be
   // the last one of the list to allow the remainingTests logic below to work
   // as expected.
+  //
+  // Skip GPU tests for now because they don't actually run anything and they
+  // trigger some shutdown hang on Windows
+  // FIXME: Bug XXX
   var processTypes = ["tab", "socket", "rdd", "gmplugin", "gpu"];
 
   // A callback called after each test-result.