--- a/testing/mozharness/configs/unittests/linux_unittest.py
+++ b/testing/mozharness/configs/unittests/linux_unittest.py
@@ -192,16 +192,17 @@ config = {
         "plain-chunked": ["--chunk-by-dir=4"],
         "mochitest-push": ["--subsuite=push"],
         "chrome": ["--chrome"],
         "chrome-chunked": ["--chrome", "--chunk-by-dir=4"],
         "browser-chrome": ["--browser-chrome"],
         "browser-chrome-chunked": ["--browser-chrome", "--chunk-by-runtime"],
         "browser-chrome-addons": ["--browser-chrome", "--chunk-by-runtime", "--tag=addons"],
         "browser-chrome-coverage": ["--timeout=1200"],
+        "browser-chrome-screenshots": ["--browser-chrome", "--subsuite=screenshots"],
         "mochitest-gl": ["--subsuite=webgl"],
         "mochitest-devtools-chrome": ["--browser-chrome", "--subsuite=devtools"],
         "mochitest-devtools-chrome-chunked": ["--browser-chrome", "--subsuite=devtools", "--chunk-by-runtime"],
         "jetpack-package": ["--jetpack-package"],
         "jetpack-addon": ["--jetpack-addon"],
         "a11y": ["--a11y"],
     },
     # local webapprt suites

--- a/testing/mozharness/configs/unittests/win_unittest.py
+++ b/testing/mozharness/configs/unittests/win_unittest.py
@@ -167,16 +167,17 @@ config = {
         "plain": [],
         "plain-chunked": ["--chunk-by-dir=4"],
         "mochitest-push": ["--subsuite=push"],
         "chrome": ["--chrome"],
         "chrome-chunked": ["--chrome", "--chunk-by-dir=4"],
         "browser-chrome": ["--browser-chrome"],
         "browser-chrome-chunked": ["--browser-chrome", "--chunk-by-runtime"],
         "browser-chrome-addons": ["--browser-chrome", "--chunk-by-runtime", "--tag=addons"],
+        "browser-chrome-screenshots": ["--browser-chrome", "--subsuite=screenshots"],
         "mochitest-gl": ["--subsuite=webgl"],
         "mochitest-devtools-chrome": ["--browser-chrome", "--subsuite=devtools"],
         "mochitest-devtools-chrome-chunked": ["--browser-chrome", "--subsuite=devtools", "--chunk-by-runtime"],
         "mochitest-metro-chrome": ["--browser-chrome", "--metro-immersive"],
         "jetpack-package": ["--jetpack-package"],
         "jetpack-addon": ["--jetpack-addon"],
         "a11y": ["--a11y"],
     },