diff --git a/docshell/test/mochitest/mochitest.ini b/docshell/test/mochitest/mochitest.ini
index f9e5a2dc224a..784c00b7c0a2 100644
--- a/docshell/test/mochitest/mochitest.ini
+++ b/docshell/test/mochitest/mochitest.ini
@@ -77,13 +77,10 @@ skip-if = true
 skip-if = toolkit != "cocoa" || headless # Headless: bug 1410525
 support-files = file_bug511449.html
 [test_bug529119-1.html]
-skip-if =
-  fission && os == "android" # Bug 1827321
 [test_bug529119-2.html]
 skip-if =
   http3
   http2
-  fission && os == "android" # Bug 1827321
 [test_bug530396.html]
 support-files = bug530396-noref.sjs bug530396-subframe.html
 skip-if =
diff --git a/dom/ipc/ProcessIsolation.cpp b/dom/ipc/ProcessIsolation.cpp
index cd223e647f1a..f7025af4d121 100644
--- a/dom/ipc/ProcessIsolation.cpp
+++ b/dom/ipc/ProcessIsolation.cpp
@@ -576,6 +576,17 @@ Result<NavigationIsolationOptions, nsresult> IsolationOptionsForNavigation(
     }
   }
 
+#ifdef MOZ_WIDGET_ANDROID
+  // If we're loading an error page on android, it must complete within the same
+  // process as the errored page load would complete in due to code expecting
+  // that behavior. See bug 1673763.
+  if (aLoadStateLoadType == LOAD_ERROR_PAGE) {
+    MOZ_LOG(gProcessIsolationLog, LogLevel::Verbose,
+            ("Forcing error page load to complete in the current process"));
+    behavior = IsolationBehavior::Anywhere;
+  }
+#endif
+
   // If we're loading for a specific extension, we'll need to perform a
   // BCG-switching load to get our toplevel extension window in the correct
   // BrowsingContextGroup.
diff --git a/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/NavigationDelegateTest.kt b/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/NavigationDelegateTest.kt
index f688b498f59a..c055e2210e39 100644
--- a/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/NavigationDelegateTest.kt
+++ b/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/NavigationDelegateTest.kt
@@ -228,24 +228,24 @@ class NavigationDelegateTest : BaseSessionTest() {
     }
 
     @Test fun loadFileNotFound() {
-        // TODO: Bug 1673954
-        assumeThat(sessionRule.env.isFission, equalTo(false))
-
         testLoadExpectError(
             "file:///test.mozilla",
             WebRequestError.ERROR_CATEGORY_URI,
             WebRequestError.ERROR_FILE_NOT_FOUND,
         )
 
-        val promise = mainSession.evaluatePromiseJS("document.addCertException(false)")
-        var exceptionCaught = false
-        try {
-            val result = promise.value as Boolean
-            assertThat("Promise should not resolve", result, equalTo(false))
-        } catch (e: GeckoSessionTestRule.RejectedPromiseException) {
-            exceptionCaught = true
+        // This is temporarily disabled on Fission. See bug 1673954
+        if (!sessionRule.env.isFission) {
+            val promise = mainSession.evaluatePromiseJS("document.addCertException(false)")
+            var exceptionCaught = false
+            try {
+                val result = promise.value as Boolean
+                assertThat("Promise should not resolve", result, equalTo(false))
+            } catch (e: GeckoSessionTestRule.RejectedPromiseException) {
+                exceptionCaught = true
+            }
+            assertThat("document.addCertException failed with exception", exceptionCaught, equalTo(true))
         }
-        assertThat("document.addCertException failed with exception", exceptionCaught, equalTo(true))
     }
 
     @Test fun loadUnknownHost() {