diff --git a/.stylelintrc b/.stylelintrc
index c705193f8a919..3edcadaadbb0a 100644
--- a/.stylelintrc
+++ b/.stylelintrc
@@ -13,9 +13,6 @@
     "color-no-invalid-hex": true,
     "declaration-block-no-duplicate-properties": true,
     "declaration-block-no-redundant-longhand-properties": true,
-    "declaration-property-value-disallowed-list": {
-      "float": ["inline-start", "inline-end"]
-    },
     "length-zero-no-unit": [true, {
       "ignore": ["custom-properties"]
     }],
diff --git a/gulpfile.mjs b/gulpfile.mjs
index 673252d417ef4..46a339770dcdb 100644
--- a/gulpfile.mjs
+++ b/gulpfile.mjs
@@ -82,7 +82,7 @@ const config = JSON.parse(fs.readFileSync(CONFIG_FILE).toString());
 
 const ENV_TARGETS = [
   "last 2 versions",
-  "Chrome >= 110",
+  "Chrome >= 118",
   "Firefox ESR",
   "Safari >= 16.4",
   "Node >= 20",
@@ -1297,10 +1297,6 @@ function createDefaultPrefsFile() {
   return createStringSource(defaultFileName, buf.join("\n"));
 }
 
-function replaceMozcentralCSS() {
-  return replace(/var\(--(inline-(?:start|end))\)/g, "$1");
-}
-
 gulp.task(
   "mozcentral",
   gulp.series(
@@ -1376,7 +1372,6 @@ gulp.task(
               autoprefixer(MOZCENTRAL_AUTOPREFIXER_CONFIG),
             ])
           )
-          .pipe(replaceMozcentralCSS())
           .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
 
         preprocessCSS("web/viewer-geckoview.css", gvDefines)
@@ -1386,7 +1381,6 @@ gulp.task(
               autoprefixer(MOZCENTRAL_AUTOPREFIXER_CONFIG),
             ])
           )
-          .pipe(replaceMozcentralCSS())
           .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
 
         gulp
diff --git a/web/tree.css b/web/tree.css
index 2dd628dc4b76e..346b62c1d1308 100644
--- a/web/tree.css
+++ b/web/tree.css
@@ -46,7 +46,7 @@
       }
 
       position: relative;
-      float: var(--inline-start);
+      float: inline-start;
       height: 0;
       width: 0;
       color: rgb(255 255 255 / 0.5);
diff --git a/web/viewer.css b/web/viewer.css
index 17dd46b38fdd7..f2e313a1351f6 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -17,10 +17,6 @@
 
 :root {
   --dir-factor: 1;
-  /*#if !MOZCENTRAL*/
-  --inline-start: left;
-  --inline-end: right;
-  /*#endif*/
 
   --sidebar-width: 200px;
   --sidebar-transition-duration: 200ms;
@@ -132,10 +128,6 @@
 
 :root:dir(rtl) {
   --dir-factor: -1;
-  /*#if !MOZCENTRAL*/
-  --inline-start: right;
-  --inline-end: left;
-  /*#endif*/
 }
 
 @media screen and (forced-colors: active) {
@@ -417,7 +409,7 @@ body {
 }
 
 .splitToolbarButtonSeparator {
-  float: var(--inline-start);
+  float: inline-start;
   width: 0;
   height: 62%;
   border-left: 1px solid var(--separator-color);