diff --git a/build.js b/build.js
index ca7253b..fb1df2e 100644
--- a/build.js
+++ b/build.js
@@ -23,8 +23,9 @@ let cssFiles = readdirSync(join(__dirname, 'src'));
 
 // Generate all the SCSS using the CLI
 console.log(logMeta + 'generating SASS/SCSS -> CSS');
+const outputStyle = process.env.STYLE_ENV === 'dev' ? 'expanded' : 'compressed';
 for (const cssFile of cssFiles) {
-  execSync(`npx node-sass src/${cssFile}/ --output-style compressed -o ${tempPath}`);
+  execSync(`npx node-sass src/${cssFile}/ --output-style ${outputStyle} -o ${tempPath}`);
   console.log(`${logMeta}✔ ${cssFile}`);
 }
 
@@ -62,7 +63,7 @@ for (const cssFile of cssFiles) {
   const usercssLength = '==/UserStyle== */'.length;
   css =
     css.substring(0, usercssIndex + usercssLength) +
-    `\n@-moz-document domain(${usercss.namespace}) {\n  ` +
+    `\n@-moz-document domain("${usercss.namespace}") {\n` +
     css.substring(usercssIndex + usercssLength + 1, css.length) +
     '}\n';
   writeFileSync(cssPath, css);