diff --git a/devtools/docs/backend/actor-registration.md b/devtools/docs/backend/actor-registration.md
index 6355dfb288aa..0e1090285e74 100644
--- a/devtools/docs/backend/actor-registration.md
+++ b/devtools/docs/backend/actor-registration.md
@@ -4,9 +4,9 @@
 
 Tab actors are the most common types of actors. That's the type of actors you will most probably be adding.
 
-Tab actors target a document, this could be a tab in Firefox, an app on B2G or a remote document in Firefox for Android/Safari/Chrome for Android (via Valence).
+Tab actors target a document, this could be a tab in Firefox or a remote document in Firefox for Android/Safari/Chrome for Android (via Valence).
 
-Global actors however are for the rest, for things not related to any particular document but instead for things global to the whole Firefox/B2G/Chrome/Safari intance the toolbox is connected to (e.g. the preference actor).
+Global actors however are for the rest, for things not related to any particular document but instead for things global to the whole Firefox/Chrome/Safari intance the toolbox is connected to (e.g. the preference actor).
 
 ## The DebuggerServer.registerModule function
 
@@ -38,4 +38,4 @@ If you are adding a new actor from an add-on, you should call `DebuggerServer.re
 
 The `DebuggerServer` loads and creates all of the actors lazily to keep the initial memory usage down (which is extremely important on lower end devices).
 
-It becomes especially important when debugging apps on b2g or pages with e10s when there are more than one process, because that's when we need to spawn a `DebuggerServer` per process (it may not be immediately obvious that the server in the main process is mostly only here for piping messages to the actors in the child process).
+It becomes especially important when debugging pages with e10s when there are more than one process, because that's when we need to spawn a `DebuggerServer` per process (it may not be immediately obvious that the server in the main process is mostly only here for piping messages to the actors in the child process).