diff --git a/browser/config/mozconfigs/linux64/debug-lto b/browser/config/mozconfigs/linux64/debug-lto
deleted file mode 100644
--- a/browser/config/mozconfigs/linux64/debug-lto
+++ /dev/null
@@ -1,17 +0,0 @@
-ac_add_options --enable-debug
-ac_add_options --enable-optimize="-O1"
-
-. $topsrcdir/build/mozconfig.stylo
-
-. $topsrcdir/build/unix/mozconfig.lto
-
-# Enable Telemetry
-export MOZ_TELEMETRY_REPORTING=1
-
-# Package js shell.
-export MOZ_PACKAGE_JSSHELL=1
-
-# Need this to prevent name conflicts with the normal nightly build packages
-export MOZ_PKG_SPECIAL=lto
-
-. "$topsrcdir/build/mozconfig.common.override"
diff --git a/browser/config/mozconfigs/linux64/nightly-lto b/browser/config/mozconfigs/linux64/nightly-lto
deleted file mode 100644
--- a/browser/config/mozconfigs/linux64/nightly-lto
+++ /dev/null
@@ -1,14 +0,0 @@
-ac_add_options --disable-debug
-ac_add_options --enable-optimize="-O2"
-
-. $topsrcdir/build/mozconfig.stylo
-
-. $topsrcdir/build/unix/mozconfig.lto
-
-# Package js shell.
-export MOZ_PACKAGE_JSSHELL=1
-
-# Need this to prevent name conflicts with the normal nightly build packages
-export MOZ_PKG_SPECIAL=lto
-
-. "$topsrcdir/build/mozconfig.common.override"
diff --git a/build/unix/mozconfig.lto b/build/unix/mozconfig.lto
deleted file mode 100644
--- a/build/unix/mozconfig.lto
+++ /dev/null
@@ -1,10 +0,0 @@
-MOZ_AUTOMATION_L10N_CHECK=0
-
-. "$topsrcdir/build/unix/mozconfig.linux"
-
-# Use Clang as specified in manifest
-export AR="$topsrcdir/clang/bin/llvm-ar"
-export NM="$topsrcdir/clang/bin/llvm-nm"
-export RANLIB="$topsrcdir/clang/bin/llvm-ranlib"
-
-ac_add_options --enable-lto
diff --git a/taskcluster/ci/build/linux.yml b/taskcluster/ci/build/linux.yml
--- a/taskcluster/ci/build/linux.yml
+++ b/taskcluster/ci/build/linux.yml
@@ -784,78 +784,10 @@
         - linux64-rust-size
         - linux64-cbindgen
         - linux64-sccache
         - linux64-node
 
-linux64-lto/opt:
-    description: "Linux64 Opt LTO"
-    index:
-        product: firefox
-        job-name: linux64-lto-opt
-    treeherder:
-        platform: linux64/lto
-        symbol: Bo
-        tier: 2
-    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
-    worker:
-        env:
-            PERFHERDER_EXTRA_OPTIONS: "opt lto"
-        max-run-time: 7200
-    run:
-        using: mozharness
-        actions: [get-secrets build check-test update]
-        config:
-            - builds/releng_base_firefox.py
-            - builds/releng_base_linux_64_builds.py
-        script: "mozharness/scripts/fx_desktop_build.py"
-        secrets: true
-        custom-build-variant-cfg: lto-tc
-        tooltool-downloads: public
-        need-xvfb: true
-    toolchains:
-        - linux64-binutils
-        - linux64-clang
-        - linux64-rust
-        - linux64-rust-size
-        - linux64-cbindgen
-        - linux64-sccache
-        - linux64-node
-
-linux64-lto/debug:
-    description: "Linux64 Debug LTO"
-    index:
-        product: firefox
-        job-name: linux64-lto-debug
-    treeherder:
-        platform: linux64/lto
-        symbol: Bd
-        tier: 2
-    worker-type: aws-provisioner-v1/gecko-{level}-b-linux
-    worker:
-        env:
-            PERFHERDER_EXTRA_OPTIONS: "debug lto"
-        max-run-time: 7200
-    run:
-        using: mozharness
-        actions: [get-secrets build check-test update]
-        config:
-            - builds/releng_base_firefox.py
-            - builds/releng_base_linux_64_builds.py
-        script: "mozharness/scripts/fx_desktop_build.py"
-        secrets: true
-        custom-build-variant-cfg: lto-tc-and-debug
-        tooltool-downloads: public
-        need-xvfb: true
-    toolchains:
-        - linux64-binutils
-        - linux64-clang
-        - linux64-rust
-        - linux64-rust-size
-        - linux64-cbindgen
-        - linux64-sccache
-        - linux64-node
-
 linux64-nightly/opt:
     description: "Linux64 Nightly"
     attributes:
         nightly: true
         enable-full-crashsymbols: true
diff --git a/testing/mozharness/configs/builds/releng_sub_linux_configs/64_lto_tc.py b/testing/mozharness/configs/builds/releng_sub_linux_configs/64_lto_tc.py
deleted file mode 100644
--- a/testing/mozharness/configs/builds/releng_sub_linux_configs/64_lto_tc.py
+++ /dev/null
@@ -1,10 +0,0 @@
-config = {
-    'default_actions': [
-        'clobber',
-        'build',
-        'check-test',
-        # 'update',
-    ],
-    'stage_platform': 'linux64-lto',
-    'mozconfig_variant': 'nightly-lto',
-}
diff --git a/testing/mozharness/configs/builds/releng_sub_linux_configs/64_lto_tc_and_debug.py b/testing/mozharness/configs/builds/releng_sub_linux_configs/64_lto_tc_and_debug.py
deleted file mode 100644
--- a/testing/mozharness/configs/builds/releng_sub_linux_configs/64_lto_tc_and_debug.py
+++ /dev/null
@@ -1,11 +0,0 @@
-config = {
-    'default_actions': [
-        'clobber',
-        'build',
-        'check-test',
-        # 'update',
-    ],
-    'stage_platform': 'linux64-lto-debug',
-    'debug_build': True,
-    'mozconfig_variant': 'debug-lto',
-}
diff --git a/testing/mozharness/mozharness/mozilla/building/buildbase.py b/testing/mozharness/mozharness/mozilla/building/buildbase.py
--- a/testing/mozharness/mozharness/mozilla/building/buildbase.py
+++ b/testing/mozharness/mozharness/mozilla/building/buildbase.py
@@ -414,12 +414,10 @@
         'cross-artifact': 'builds/releng_sub_%s_configs/%s_cross_artifact.py',
         'debug': 'builds/releng_sub_%s_configs/%s_debug.py',
         'fuzzing-debug': 'builds/releng_sub_%s_configs/%s_fuzzing_debug.py',
         'asan-and-debug': 'builds/releng_sub_%s_configs/%s_asan_and_debug.py',
         'asan-tc-and-debug': 'builds/releng_sub_%s_configs/%s_asan_tc_and_debug.py',
-        'lto-tc': 'builds/releng_sub_%s_configs/%s_lto_tc.py',
-        'lto-tc-and-debug': 'builds/releng_sub_%s_configs/%s_lto_tc_and_debug.py',
         'stat-and-debug': 'builds/releng_sub_%s_configs/%s_stat_and_debug.py',
         'code-coverage-debug': 'builds/releng_sub_%s_configs/%s_code_coverage_debug.py',
         'code-coverage-opt': 'builds/releng_sub_%s_configs/%s_code_coverage_opt.py',
         'source': 'builds/releng_sub_%s_configs/%s_source.py',
         'noopt-debug': 'builds/releng_sub_%s_configs/%s_noopt_debug.py',