Bug 1814215: Add a release assert r=valentin,necko-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D179449

netwerk/protocol/http/nsHttpChannelAuthProvider.cpp

@@ -88,6 +88,7 @@ nsHttpChannelAuthProvider::nsHttpChannelAuthProvider()
       mHttpHandler(gHttpHandler) {}
 
 nsHttpChannelAuthProvider::~nsHttpChannelAuthProvider() {
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(!mAuthChannel, "Disconnect wasn't called");
 }