Prefix ids with "linked_in_"

src/Background.purs

@@ -57,7 +57,7 @@ contentScriptMessageHandler
     maybeMsg (JobOffer jo) = ado
       url <- cleanUpUrl url
     in NativeMessageAddJob {
-        id: I64.toString jobId,
+        id: "linked_in_" <> I64.toString jobId,
         origin: "linked_in",
         title: jo.title,
         url,