--- a/dom/base/nsTreeSanitizer.cpp
+++ b/dom/base/nsTreeSanitizer.cpp
@@ -1242,18 +1242,20 @@ nsTreeSanitizer::SanitizeAttributes(mozi
         // <meta name itemprop> or
         // <link rel itemprop>
         continue;
       }
       const char16_t* localStr = attrLocal->GetUTF16String();
       uint32_t localLen = attrLocal->GetLength();
       // Allow underscore to cater to the MCE editor library.
       // Allow data-* on SVG and MathML, too, as a forward-compat measure.
+      // Allow aria-* on all for simplicity.
       if (UTF16StringStartsWith(localStr, localLen, u"_") ||
-          UTF16StringStartsWith(localStr, localLen, u"data-")) {
+          UTF16StringStartsWith(localStr, localLen, u"data-") ||
+          UTF16StringStartsWith(localStr, localLen, u"aria-")) {
         continue;
       }
       // else not allowed
     } else if (kNameSpaceID_XML == attrNs) {
       if (nsGkAtoms::base == attrLocal) {
         if (SanitizeURL(aElement, attrNs, attrLocal)) {
           // in case the attribute removal shuffled the attribute order, start
           // the loop again.