Index: doc/build.md
==================================================================
--- doc/build.md
+++ doc/build.md
@@ -51,13 +51,18 @@
 
 > Install the LibreOffice extension.
 
 `-fx --firefox`
 
-> Launch Firefox Nightly.
+> Launch Firefox Developper (before Firefox 57).
 > Unit tests can be lanched from Firefox, with CTRL+SHIFT+F12.
 
+`-we --webext`
+
+> Launch Firefox Nightly (Firefox 57+).
+> Unit tests can be lanched from the menu.
+
 `-tb --thunderbird`
 
 > Launch Thunderbird.
 
 

Index: make.py
==================================================================
--- make.py
+++ make.py
@@ -285,11 +285,11 @@
     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 XPI testing", action="store_true")
+    xParser.add_argument("-fx", "--firefox", help="Launch Firefox Developper for Adden-SDK 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()