diff --git a/.github/scripts/otter-adapt-upstream.sh b/.github/scripts/otter-adapt-upstream.sh
index 0106ee7b2557..7e2ac635cc48 100755
--- a/.github/scripts/otter-adapt-upstream.sh
+++ b/.github/scripts/otter-adapt-upstream.sh
@@ -25,6 +25,12 @@ perl -pi -e 's/^(    timeout-minutes: )10$/${1}20/' .github/workflows/release.ym
 # web test job needs more time than upstream's 8-vCPU runners do.
 perl -0pi -e 's/(\n  test_web:\n(?:    .*\n)*?    timeout-minutes: )10\n/${1}20\n/' .github/workflows/ci.yml
 
+# A single browser session over every web browser test runs Chromium out of memory on
+# the 16 GB GitHub-hosted runners, closing the page at a different file each run. Separate
+# processes and two browser shards give each a fresh Chromium.
+perl -pi -e 's|^(\s+)run: vp run --filter \@t3tools/web test$|$1run: \|\n$1  cd apps/web\n$1  vp test run --passWithNoTests --project unit\n$1  vp test run --passWithNoTests --project browser --shard 1/2\n$1  vp test run --passWithNoTests --project browser --shard 2/2|' \
+  .github/workflows/ci.yml .github/workflows/release.yml
+
 # The production relay deploy must run for this repository after an upstream sync.
 python3 - <<'PY_RELAY'
 from pathlib import Path
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f9c7e141b045..c734248a7c30 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -406,7 +406,11 @@ jobs:
           fi
 
       - name: Test
-        run: vp run --filter @t3tools/web test
+        run: |
+          cd apps/web
+          vp test run --passWithNoTests --project unit
+          vp test run --passWithNoTests --project browser --shard 1/2
+          vp test run --passWithNoTests --project browser --shard 2/2
 
   # apps/server sets `fileParallelism: false`, so its test files run strictly
   # one at a time. Sharding spreads them over separate runners instead of
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index be78992df7a3..bfdede3dc7ef 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -344,7 +344,11 @@ jobs:
           fi
 
       - name: Test
-        run: vp run --filter @t3tools/web test
+        run: |
+          cd apps/web
+          vp test run --passWithNoTests --project unit
+          vp test run --passWithNoTests --project browser --shard 1/2
+          vp test run --passWithNoTests --project browser --shard 2/2
 
       # Browser tests run source modules; this boots the production chunk graph.
       - name: Boot the built web client