diff --git a/.editorconfig b/.editorconfig
index 74835044e555..e93ea3f1b6c3 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -6,6 +6,7 @@ root = true
 end_of_line = lf
 insert_final_newline = true
 charset = utf-8
+trim_trailing_whitespace = true
 
 [src/chrome/content/rules/*.xml]
 indent_style = tab