Bug 1511249 - Ensure that 3rdPartyStorage permissions are checked with the exact tracker origin not just with a prefix r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D13499

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

browser/modules/PermissionUI.jsm

@@ -1051,6 +1051,13 @@ StorageAccessPermissionPrompt.prototype = {
     let origins = new Set();
     while (perms.length) {
       let perm = perms.shift();
+      // Let's make sure that we're not looking at a permission for
+      // https://exampletracker.company when we mean to look for the
+      // permisison for https://exampletracker.com!
+      if (perm.type != prefix &&
+          !perm.type.startsWith(`${prefix}^`)) {
+        continue;
+      }
       origins.add(perm.principal.origin);
     }
     return origins.size;