Index: gc_lang/fr/build.py
==================================================================
--- gc_lang/fr/build.py
+++ gc_lang/fr/build.py
@@ -91,10 +91,12 @@
             hZip.write(spDict+"/"+sp+"/"+sp+".dic", "content/dictionaries/"+sp+"/"+sp+".dic")
             hZip.write(spDict+"/"+sp+"/"+sp+".aff", "content/dictionaries/"+sp+"/"+sp+".aff")
     hZip.close()
     spfDebugProfile = dVars['win_tb_debug_extension_path']  if platform.system() == "Windows"  else dVars['linux_tb_debug_extension_path']
     helpers.unzip(spfZip, spfDebugProfile)
+    spfBetaProfile = dVars['win_tb_beta_extension_path']  if platform.system() == "Windows"  else dVars['linux_tb_beta_extension_path']
+    helpers.unzip(spfZip, spfBetaProfile)
 
 
 def _createOptionsForThunderbird (dVars):
     dVars['sXULTabs'] = ""
     dVars['sXULTabPanels'] = ""

Index: gc_lang/fr/config.ini
==================================================================
--- gc_lang/fr/config.ini
+++ gc_lang/fr/config.ini
@@ -46,12 +46,18 @@
 linux_fx_nightly_path = /usr/bin/firefox
 
 # Thunderbird
 tb_identifier = French-GC-TB@grammalecte.net
 tb_name = Grammalecte [fr]
-win_tb_debug_extension_path = D:\_temp\tb-beta.profile\extensions\French-GC-TB@grammalecte.net
-linux_tb_debug_extension_path = ~/tb-beta.profile/extensions/French-GC-TB@grammalecte.net
+win_tb_path = C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe
+win_tb_beta_path = C:\Program Files (x86)\Mozilla Thunderbird (Beta)\thunderbird.exe
+linux_tb_path = /usr/bin/thunderbird
+linux_tb_beta_path = /usr/bin/thunderbird
+win_tb_debug_extension_path = D:\_temp\tb-debug.profile\extensions\French-GC-TB@grammalecte.net
+linux_tb_debug_extension_path = ~/tb-debug.profile/extensions/French-GC-TB@grammalecte.net
+win_tb_beta_extension_path = D:\_temp\tb-beta.profile\extensions\French-GC-TB@grammalecte.net
+linux_tb_beta_extension_path = ~/tb-beta.profile/extensions/French-GC-TB@grammalecte.net
 # Set Thunderbird folder in your PATH variable
 # Create a local profile:
 #     	thunderbird -CreateProfile "debug _build\tb-debug.profile"
 # Or you can use the GUI with:
 #	 	thunderbird -P

Index: make.py
==================================================================
--- make.py
+++ make.py
@@ -363,10 +363,11 @@
     xParser.add_argument("-aed", "--add_extended_dictionary", help="add extended dictionary to the build", action="store_true")
     xParser.add_argument("-apd", "--add_personal_dictionary", help="add personal dictionary to the build", 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("-tbb", "--thunderbird_beta", help="Launch Thunderbird Beta", 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()
 
     if xArgs.build_data:
         xArgs.build_data_before = True
@@ -448,15 +449,21 @@
                         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")
+                spfThunderbird = '"'+dVars['win_tb_path']+'"'  if platform.system() == "Windows"  else dVars['linux_tb_path']
+                print(spfThunderbird)
+                os.system(spfThunderbird + ' -jsconsole -P debug')
+            if xArgs.thunderbird_beta:
+                spfThunderbird = '"'+dVars['win_tb_beta_path']+'"'  if platform.system() == "Windows"  else dVars['linux_tb_beta_path']
+                print(spfThunderbird)
+                os.system(spfThunderbird + ' -jsconsole -P beta')
         else:
             print("Folder not found: gc_lang/"+sLang)
 
     oNow = datetime.datetime.now()
     print("============== MAKE GRAMMALECTE [finished] at {0.hour:>2} h {0.minute:>2} min {0.second:>2} s ==============".format(oNow))
 
 
 if __name__ == '__main__':
     main()