I think that you can find the solution on the lein-cljsbuild repl-support page, https://github.com/emezeske/lein-cljsbuild/blob/1.0.1/doc/REPL.md#repl-launch
You can specify the repl-launch-commands as cljs-build properties
(defproject lein-cljsbuild-example "1.2.3"
:plugins [[lein-cljsbuild "1.0.1"]]
:cljsbuild {
:repl-listen-port 9000
:repl-launch-commands
{"my-launch" ["firefox" "-jsconsole" "http://localhost/my-page"]})
There is also a @cemerick/austin project very releated with this problematic that maybe can helps you too. (Browser-connected REPLs)