Index: make.py
==================================================================
--- make.py
+++ make.py
@@ -286,11 +286,11 @@
     xParser.add_argument("-d", "--dict", help="generate FSA dictionary", action="store_true")
     xParser.add_argument("-t", "--tests", help="run unit tests", action="store_true")
     xParser.add_argument("-p", "--perf", help="run performance tests", action="store_true")
     xParser.add_argument("-pm", "--perf_memo", help="run performance tests and store results in perf_memo.txt", action="store_true")
     xParser.add_argument("-js", "--javascript", help="JavaScript build for Firefox", action="store_true")
-    xParser.add_argument("-fx", "--firefox", help="Launch Firefox Nightly for WebExtension testing", action="store_true")
+    xParser.add_argument("-fx", "--firefox", help="Launch Firefox Developper for WebExtension testing", action="store_true")
     xParser.add_argument("-we", "--web_ext", help="Launch Firefox Nightly for WebExtension testing", action="store_true")
     xParser.add_argument("-tb", "--thunderbird", help="Launch Thunderbird", action="store_true")
     xParser.add_argument("-i", "--install", help="install the extension in Writer (path of unopkg must be set in config.ini)", action="store_true")
     xArgs = xParser.parse_args()
 
@@ -354,12 +354,18 @@
                 with helpers.cd("_build/xpi/"+sLang):
                     spfFirefox = dVars['win_fx_dev_path']  if platform.system() == "Windows"  else dVars['linux_fx_dev_path']
                     os.system('jpm run -b "' + spfFirefox + '"')
 
             if xArgs.web_ext or xArgs.firefox:
+                
                 with helpers.cd("_build/webext/"+sLang):
-                    spfFirefox = dVars['win_fx_nightly_path']  if platform.system() == "Windows"  else dVars['linux_fx_nightly_path']
+                    if xArgs.firefox:
+                        # Firefox Developper edition
+                        spfFirefox = dVars['win_fx_dev_path']  if platform.system() == "Windows"  else dVars['linux_fx_dev_path']
+                    else:
+                        # Firefox Nightly edition
+                        spfFirefox = dVars['win_fx_nightly_path']  if platform.system() == "Windows"  else dVars['linux_fx_nightly_path']
                     os.system(r'web-ext run --firefox="' + spfFirefox + '" --browser-console --firefox-profile=debug')            
 
             # Thunderbird
             if xArgs.thunderbird:
                 os.system("thunderbird -jsconsole -P debug")