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diff --git a/build/sanitizers/lsan_suppressions.txt b/build/sanitizers/lsan_suppressions.txt
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+### !!! Please do not add suppressions for new leaks in Gecko code, unless they are intentional !!!
+
+###
+### Some of these leak in every test run.
+###
+
+# LSan runs with a shallow stack depth and no debug symbols, so some small intentional
+# leaks in system libraries show up with this.  You do not want this enabled
+# when running locally with a deep stack, as it can catch too much.
+leak:libc.so
+
+# nsComponentManagerImpl intentionally leaks factory entries, and probably some other stuff.
+leak:nsComponentManagerImpl
+# These two variants are needed when fast unwind is disabled and stack depth is limited.
+leak:mozJSComponentLoader::LoadModule
+leak:nsNativeModuleLoader::LoadModule
+
+# Bug 981220 - Pixman fails to free TLS memory.
+leak:pixman_implementation_lookup_composite
+
+# Bug 987918 - Font shutdown leaks when CLEANUP_MEMORY is not enabled.
+leak:libfontconfig.so
+leak:GI___strdup
+# The symbol is really __GI___strdup, but if you have the leading _, it doesn't suppress it.
+
+# Bug 1078015 - If the process terminates during a PR_Sleep, LSAN  detects a leak
+leak:PR_Sleep
+
+###
+### Many leaks only affect some test suites.  The suite annotations are not checked.
+###
+
+# Bug 979928 - WebRTC leaks in different mochitest suites.
+leak:NR_reg_init
+# nr_reg_local_init should be redundant with NR_reg_init, but on Aurora
+# we get fewer stack frames for some reason.
+leak:nr_reg_local_init
+leak:r_log_register
+leak:nr_reg_set
+
+# This is a one-time leak in mochitest-bc, so it is probably okay to ignore.
+leak:GlobalPrinters::InitializeGlobalPrinters
+leak:nsPSPrinterList::GetPrinterList
+
+# Bug 1028456 - Various NSPR fd-related leaks in different mochitest suites.
+leak:_PR_Getfd
+
+# Bug 1028483 - The XML parser sometimes leaks an object. Mostly happens in toolkit/components/thumbnails.
+leak:processInternalEntity
+
+# Bug 1187421 - NSS does not always free the error stack in different mochitest suites.
+leak:nss_ClearErrorStack
+
+###
+### Leaks with system libraries in their stacks. These show up across a number of tests.
+### Better symbols and disabling fast stackwalking may help diagnose these.
+###
+
+leak:libcairo.so
+leak:libdl.so
+leak:libdricore.so
+leak:libdricore9.2.1.so
+leak:libGL.so
+leak:libglib-2.0.so
+leak:libglsl.so
+leak:libp11-kit.so
+leak:libpixman-1.so
+leak:libpulse.so
+leak:libpulsecommon-1.1.so
+leak:libresolv.so
+leak:libstdc++.so
+leak:libXrandr.so
+leak:pthread_setspecific_internal
+leak:swrast_dri.so