diff --git a/.browserslistrc b/.browserslistrc
index c5c51ebe074..f484401089a 100644
--- a/.browserslistrc
+++ b/.browserslistrc
@@ -14,3 +14,4 @@ not Explorer <= 11
 not ie 11
 not android 4.4.3
 not ios_saf < 15.4
+not kaios <= 2.5 # fix floating label issues in Firefox (see https://github.com/postcss/autoprefixer/issues/1533)
diff --git a/package.json b/package.json
index eac6a010c86..c51a71724d3 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "compile": "npm-run-all css js assets copy-assets docs-compile docs-format flatten-build",
     "production": "npm-run-all clean lint compile bundlewatch",
     "watch": "concurrently \"npm:watch-*\"",
-    "watch-css-main": "nodemon --watch src/scss/ --ext scss --exec \"npm-run-all css-lint css-compile copy-assets\"",
+    "watch-css-main": "nodemon --watch src/scss/ --ext scss --exec \"npm-run-all css-lint css-compile css-prefix copy-assets\"",
     "watch-css-dist": "nodemon --watch dist/css/ --ext css --ignore \"dist/css/*.rtl.*\" --exec \"npm run css-rtl\"",
     "watch-js-main": "nodemon --watch src/ts/ --ext ts --exec \"npm-run-all js-lint js-compile copy-assets\"",
     "watch-assets": "nodemon --watch src/assets/ --exec \"npm run assets\""