Added missing leading slash in a path

extension/core/bg/runner.js

@@ -69,7 +69,7 @@ singlefile.runner = (() => {
 			"/lib/single-file/modules/html-images-alt-minifier.js"
 		],
 		removeUnusedStyles: [
-			"lib/single-file/vendor/css-font-property-parser.js",
+			"/lib/single-file/vendor/css-font-property-parser.js",
 			"/lib/single-file/modules/css-matched-rules.js",
 			"/lib/single-file/modules/css-rules-minifier.js",
 			"/lib/single-file/modules/css-fonts-minifier.js"