Add feature remove-diff-signs

source/content.css

@@ -219,6 +219,12 @@ followed someone
 	font-size: 13px;
 }
 
+/* For `remove-diff-signs` feature */
+.rgh-remove-diff-signs .blob-code-inner::before,
+.rgh-remove-diff-signs .blob-code-marker-cell::before { /* Commit page */
+	content: none;
+}
+
 /* Make tab indented code more readable on GitHub and Gist */
 * {
 	-moz-tab-size: 4 !important;

source/content.ts

@@ -68,6 +68,7 @@ import './features/patch-diff-links';
 import './features/swap-branches-on-compare';
 import './features/reactions-avatars';
 import './features/show-names';
+import './features/remove-diff-signs';
 import './features/mark-merge-commits-in-list';
 import './features/prev-next-commit-buttons';
 import './features/preserve-whitespace-option-in-nav';

source/features/extend-diff-expander.tsx

@@ -16,7 +16,8 @@ function init() {
 features.add({
 	id: 'extend-diff-expander',
 	include: [
-		features.isPRFiles
+		features.isPRFiles,
+		features.isCommit
 	],
 	load: features.onAjaxedPages,
 	init

source/features/remove-diff-signs.tsx

@@ -0,0 +1,14 @@
+import features from '../libs/features';
+
+function init() {
+	document.body.classList.add('rgh-remove-diff-signs');
+}
+
+features.add({
+	id: 'remove-diff-signs',
+	include: [
+		features.isPR,
+		features.isSingleCommit
+	],
+	init
+});