Fix compatibility with Firefox Nightly

Author: janodvarko

lib/har-driver-actor.js

@@ -51,8 +51,13 @@ const DevToolsUtils = safeRequire(devtools,
 );
 
 const { DebuggerServer } = devtools["require"]("devtools/server/main");
-const protocol = devtools["require"]("devtools/server/protocol");
-const { method, RetVal, ActorClass, Actor, Arg, types } = protocol;
+
+const Protocol = safeRequire(devtools,
+  "devtools/shared/protocol",
+  "devtools/server/protocol"
+);
+
+const { method, RetVal, ActorClass, Actor, Arg, types } = Protocol;
 
 // For debugging purposes. Note that the tracing module isn't available
 // on the backend (in case of remote device debugging).

lib/har-driver-front.js

@@ -10,8 +10,8 @@ module.metadata = {
 const { Cu } = require("chrome");
 
 // DevTools
-const { devtools } = require("firebug.sdk/lib/core/devtools.js");
-const { Front, FrontClass } = devtools["require"]("devtools/server/protocol");
+const DevTools = require("firebug.sdk/lib/core/devtools.js");
+const { Front, FrontClass } = DevTools.Protocol;
 
 // Firebug SDK
 const { Trace, TraceError } = require("firebug.sdk/lib/core/trace.js").get(module.id);