diff --git a/.docker/ungoogled-chromium/Dockerfile b/.docker/ungoogled-chromium/Dockerfile
index 86716a8..af21521 100644
--- a/.docker/ungoogled-chromium/Dockerfile
+++ b/.docker/ungoogled-chromium/Dockerfile
@@ -5,6 +5,7 @@ ARG API_URL="https://api.github.com/repos/macchrome/linchrome/releases/latest"
 
 #
 # install custom chromium build from woolyss with support for hevc/x265
+SHELL ["/bin/bash", "-c"]
 RUN set -eux; apt-get update; \
     apt-get install -y --no-install-recommends wget unzip libatk1.0-0 libatk-bridge2.0-0 libatomic1 \
     libcups2 libgtk-3-0 libnss3 libpci3 libxcomposite1 libxss1 openbox xz-utils jq; \
@@ -21,11 +22,27 @@ RUN set -eux; apt-get update; \
     #
     # install widevine module
     WIDEVINE_VERSION=$(wget --quiet -O - https://dl.google.com/widevine-cdm/versions.txt | tail -n 1); \
-    wget -O /tmp/widevine.zip "https://dl.google.com/widevine-cdm/$WIDEVINE_VERSION-linux-x64.zip"; \
+    wget -O /tmp/widevine.zip "https://dl.google.com/widevine-cdm/${WIDEVINE_VERSION}-linux-x64.zip"; \
     unzip -p /tmp/widevine.zip libwidevinecdm.so > /usr/lib/chromium/libwidevinecdm.so; \
     chmod 644 /usr/lib/chromium/libwidevinecdm.so; \
     rm /tmp/widevine.zip; \
     #
+    # install latest version of uBlock Origin and SponsorBlock for YouTube
+    CHROMIUM_VERSION="$(wget -O - "${API_URL}" 2>/dev/null | jq -r ".tag_name" | sed -e 's/v//' -e 's/-.*//')"; \
+    EXTENSIONS_DIR="/usr/share/chromium/extensions"; \
+    EXTENSIONS=( \
+      cjpalhdlnbpafiamejdnhcphjbkeiagm \
+      mnjggcdmjocbbbhaepdhchncahnbgone \
+    ); \
+    mkdir -p "${EXTENSIONS_DIR}"; \
+    for EXT_ID in "${EXTENSIONS[@]}"; \
+    do \
+      EXT_URL="https://clients2.google.com/service/update2/crx?response=redirect&nacl_arch=x86-64&prodversion=${CHROMIUM_VERSION}&acceptformat=crx2,crx3&x=id%3D${EXT_ID}%26installsource%3Dondemand%26uc"; \
+      EXT_PATH="${EXTENSIONS_DIR}/${EXT_ID}.crx"; \
+      wget -O "${EXT_PATH}" "${EXT_URL}"; \
+      EXT_VERSION="$(unzip -p "${EXT_PATH}" manifest.json 2>/dev/null | jq -r ".version")"; \
+      echo -e "{\n  \"external_crx\": \"${EXT_PATH}\",\n  \"external_version\": \"${EXT_VERSION}\"\n}" > "${EXTENSIONS_DIR}"/"${EXT_ID}".json; \
+    done; \
     # clean up
     apt-get --purge autoremove -y xz-utils jq; \
     apt-get clean -y; \
@@ -37,7 +54,3 @@ COPY supervisord.conf /etc/neko/supervisord/ungoogled-chromium.conf
 COPY preferences.json /usr/lib/chromium/master_preferences
 COPY policies.json /etc/chromium/policies/managed/policies.json
 COPY openbox.xml /etc/neko/openbox.xml
-
-#
-# copy extensions and policy files
-COPY extensions /usr/share/chromium/extensions
diff --git a/.docker/ungoogled-chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.crx b/.docker/ungoogled-chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.crx
deleted file mode 100644
index 69081a0..0000000
Binary files a/.docker/ungoogled-chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.crx and /dev/null differ
diff --git a/.docker/ungoogled-chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.json b/.docker/ungoogled-chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.json
deleted file mode 100644
index f2bfef7..0000000
--- a/.docker/ungoogled-chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "external_crx": "/usr/share/chromium/extensions/cjpalhdlnbpafiamejdnhcphjbkeiagm.crx",
-  "external_version": "1.42.4"
-}
diff --git a/.docker/ungoogled-chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.crx b/.docker/ungoogled-chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.crx
deleted file mode 100644
index a1e657d..0000000
Binary files a/.docker/ungoogled-chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.crx and /dev/null differ
diff --git a/.docker/ungoogled-chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.json b/.docker/ungoogled-chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.json
deleted file mode 100644
index 9648498..0000000
--- a/.docker/ungoogled-chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "external_crx": "/usr/share/chromium/extensions/mnjggcdmjocbbbhaepdhchncahnbgone.crx",
-  "external_version": "4.5.1"
-}