gistfile1.txt

diff --git a/devtools/client/debugger/new/src/client/firefox/commands.js b/devtools/client/debugger/new/src/client/firefox/commands.js
--- a/devtools/client/debugger/new/src/client/firefox/commands.js
+++ b/devtools/client/debugger/new/src/client/firefox/commands.js
@@ -179,9 +179,15 @@ async function setBreakpoint(
   location: BreakpointLocation,
   options: BreakpointOptions
 ) {
-  breakpoints[locationKey(location)] = { location, options };
-  for (const thread of getAllThreadClients()) {
-    await thread.setBreakpoint(location, options);
+  try {
+    breakpoints[locationKey(location)] = { location, options };
+    for (const thread of getAllThreadClients()) {
+      console.log("> client setBreakpoint start", thread.actor);
+      await thread.setBreakpoint(location, options);
+      console.log("> client setBreakpoint done", thread.actor);
+    }
+  } catch (e) {
+    console.log("> client setBreakpoint exception: ", e);
   }
 }
 
diff --git a/devtools/server/actors/thread.js b/devtools/server/actors/thread.js
--- a/devtools/server/actors/thread.js
+++ b/devtools/server/actors/thread.js
@@ -314,6 +314,7 @@ const ThreadActor = ActorClassWithSpec(t
   },
 
   setBreakpoint(location, options) {
+    console.log(`> setBreakpoint`, this.actorID, location)
     const actor = this.breakpointActorMap.getOrCreateBreakpointActor(location);
     actor.setOptions(options);
 
@@ -328,11 +329,15 @@ const ThreadActor = ActorClassWithSpec(t
         sourceActor.applyBreakpoint(actor);
       }
     }
+    console.log(`> setBreakpoint (done)`, this.actorID, location)
   },
 
   removeBreakpoint(location) {
+    console.log(`> removeBreakpoint`, this.actorID, location)
+
     const actor = this.breakpointActorMap.getOrCreateBreakpointActor(location);
     actor.delete();
+    console.log(`> removeBreakpoint (done)`, this.actorID, location)
   },
 
   removeXHRBreakpoint: function(path, method) {