Bug 1452908 - Fix the about:blocked link while checking Safe Browsing site status. r=johannh

Fix the about:blocked link while checking Safe Browsing site status.

Differential Revision: https://phabricator.services.mozilla.com/D7410

--HG--
extra : moz-landing-system : lando

browser/actors/BlockedSiteChild.jsm

@@ -75,7 +75,7 @@ class BlockedSiteChild extends ActorChild {
     let desc = Services.prefs.getCharPref(
       "browser.safebrowsing.provider." + provider + ".reportURL", "");
     if (desc) {
-      doc.getElementById("error_desc_link").setAttribute("href", desc + aEvent.detail.url);
+      doc.getElementById("error_desc_link").setAttribute("href", desc + encodeURIComponent(aEvent.detail.url));
     }
 
     // Set other links in error details.