diff --git a/build/debian-packages/cmake-jessie.diff b/build/debian-packages/cmake-jessie.diff
deleted file mode 100644
index 7fd301f90869..000000000000
--- a/build/debian-packages/cmake-jessie.diff
+++ /dev/null
@@ -1,70 +0,0 @@
-diff -Nru cmake-3.16.3/debian/changelog cmake-3.16.3/debian/changelog
---- cmake-3.16.3/debian/changelog	2020-03-16 19:09:14.000000000 +0900
-+++ cmake-3.16.3/debian/changelog	2020-06-24 14:59:20.000000000 +0900
-@@ -1,3 +1,17 @@
-+cmake (3.16.3-1.deb9moz1) jessie-backports; urgency=medium
-+
-+  * Mozilla backport for jessie.
-+  * debian/rules, debian/control:
-+    - Don't build against system libraries. libuv is missing on jessie, and
-+      it's just simpler to disable the use of system libraries altogether.
-+    - But still use system curl.
-+    - Don't build a dbgsym package through dh_strip, that's not supported on
-+      jessie.
-+  * debian/compat: Restore a compat level of 10.
-+  * debian/control: Remove versioned dependency on debhelper.
-+
-+ -- Mike Hommey <glandium@goemon>  Wed, 24 Jun 2020 14:59:20 +0900
-+
- cmake (3.16.3-1~bpo9+1) stretch-backports; urgency=medium
- 
-   * Rebuild for stretch-backports.
-diff -Nru cmake-3.16.3/debian/compat cmake-3.16.3/debian/compat
---- cmake-3.16.3/debian/compat	1970-01-01 09:00:00.000000000 +0900
-+++ cmake-3.16.3/debian/compat	2020-06-24 14:57:28.000000000 +0900
-@@ -0,0 +1 @@
-+10
-diff -Nru cmake-3.16.3/debian/control cmake-3.16.3/debian/control
---- cmake-3.16.3/debian/control	2020-03-16 19:09:14.000000000 +0900
-+++ cmake-3.16.3/debian/control	2020-06-24 14:59:20.000000000 +0900
-@@ -4,17 +4,10 @@
- Maintainer: Debian CMake Team <pkg-cmake-team@lists.alioth.debian.org>
- Uploaders: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>,
-            Felix Geyer <fgeyer@debian.org>
--Build-Depends: debhelper-compat (= 12),
-+Build-Depends: debhelper,
-                freebsd-glue [kfreebsd-any],
--               libarchive-dev (>= 3.3.3),
--               libbz2-dev,
-                libcurl4-openssl-dev | libcurl-ssl-dev,
--               libexpat1-dev,
--               libjsoncpp-dev,
--               liblzma-dev,
-                libncurses5-dev,
--               librhash-dev,
--               libuv1-dev (>= 1.10),
-                procps [!hurd-any],
-                python3-sphinx,
-                qtbase5-dev <!stage1>,
-diff -Nru cmake-3.16.3/debian/rules cmake-3.16.3/debian/rules
---- cmake-3.16.3/debian/rules	2020-03-16 19:09:14.000000000 +0900
-+++ cmake-3.16.3/debian/rules	2020-06-24 14:59:20.000000000 +0900
-@@ -45,7 +45,7 @@
- override_dh_auto_configure: $(BUILD_FLAGS_FILE)
- 	rm -rf Build && mkdir -p Build
- 	cd Build && ../bootstrap --prefix=/usr --docdir=/share/doc/cmake --mandir=/share/man \
--	                         --init=../$(BUILD_FLAGS_FILE) --system-libs \
-+	                         --init=../$(BUILD_FLAGS_FILE) --system-curl \
- 	                         --sphinx-man --sphinx-html --sphinx-flags="-D today=\"$(BUILD_DATE)\"" \
- 	                         $(BOOTSTRAP_PARALLEL) --verbose
- 
-@@ -71,9 +71,6 @@
- override_dh_sphinxdoc:
- 	dh_sphinxdoc -pcmake-doc
- 
--override_dh_strip:
--	dh_strip --dbgsym-migration='cmake-dbg (<< 3.5.0-1~)'
--
- %:
- 	dh $@ --with=sphinxdoc --builddirectory=Build
- 
diff --git a/taskcluster/ci/docker-image/kind.yml b/taskcluster/ci/docker-image/kind.yml
index 195f9c425215..1843ee38f623 100644
--- a/taskcluster/ci/docker-image/kind.yml
+++ b/taskcluster/ci/docker-image/kind.yml
@@ -72,11 +72,6 @@ jobs:
         symbol: I(deb8)
         parent: debian8-base
         definition: debian-build
-    debian8-mozjs-rust-build:
-        symbol: I(deb8jsrs)
-        parent: debian8-amd64-build
-        packages:
-            - deb8-cmake
     valgrind-build:
         symbol: I(vb)
         parent: debian8-amd64-build
diff --git a/taskcluster/ci/packages/kind.yml b/taskcluster/ci/packages/kind.yml
index b5e395f74abd..3b014d14cb18 100644
--- a/taskcluster/ci/packages/kind.yml
+++ b/taskcluster/ci/packages/kind.yml
@@ -60,20 +60,6 @@ jobs:
                 url: http://snapshot.debian.org/archive/debian/20170413T152542Z/pool/main/p/python-setuptools/python-setuptools_33.1.1-1%7Ebpo8%2B1.dsc
                 sha256: e5a152e45151ee2d19959d8266e9bff09f5164ee04a0613aeb8f1d7a304fa073
 
-    deb8-cmake:
-        description: "Cmake backport for Debian jessie"
-        treeherder:
-            symbol: Deb8(cmake)
-        worker:
-            env:
-                DEB_BUILD_PROFILES: stage1
-        run:
-            using: debian-package
-            dsc:
-                url: http://snapshot.debian.org/archive/debian/20200320T222820Z/pool/main/c/cmake/cmake_3.16.3-1%7Ebpo9%2B1.dsc
-                sha256: 714651ac6c974694eb3452f37a70624d3d786ac02fb8ea4eb8fddae44649105d
-            patch: cmake-jessie.diff
-
     deb10-cmake:
         description: "Cmake backport for Debian buster"
         treeherder:
diff --git a/taskcluster/docker/debian8-mozjs-rust-build/Dockerfile b/taskcluster/docker/debian8-mozjs-rust-build/Dockerfile
deleted file mode 100644
index 4fcdd795d6fe..000000000000
--- a/taskcluster/docker/debian8-mozjs-rust-build/Dockerfile
+++ /dev/null
@@ -1,12 +0,0 @@
-FROM $DOCKER_IMAGE_PARENT
-MAINTAINER Mike Hommey <mhommey@mozilla.com>
-
-VOLUME /builds/worker/checkouts
-VOLUME /builds/worker/workspace
-VOLUME /builds/worker/tooltool-cache
-
-ARG TASKCLUSTER_ROOT_URL
-ARG DOCKER_IMAGE_PACKAGES
-RUN /usr/local/sbin/setup_packages.sh $TASKCLUSTER_ROOT_URL $DOCKER_IMAGE_PACKAGES && \
-    apt-get update && \
-    apt-get install cmake