Bug 1738190 - allow opening inline SVG background images in a new tab, r=dao

Differential Revision: https://phabricator.services.mozilla.com/D165454

browser/base/content/utilityOverlay.js

@@ -423,6 +423,9 @@ function openLinkIn(url, where, params) {
         params.hasValidUserGestureActivation
       );
     }
+    if (aForceAllowDataURI) {
+      extraOptions.setPropertyAsBool("forceAllowDataURI", true);
+    }
     if (params.fromExternal !== undefined) {
       extraOptions.setPropertyAsBool("fromExternal", params.fromExternal);
     }
@@ -663,6 +666,7 @@ function openLinkIn(url, where, params) {
         allowInheritPrincipal: aAllowInheritPrincipal,
         triggeringRemoteType: aTriggeringRemoteType,
         csp: aCsp,
+        forceAllowDataURI: aForceAllowDataURI,
         focusUrlBar,
         openerBrowser: params.openerBrowser,
         fromExternal: params.fromExternal,