Index: gc_lang/fr/build.py
==================================================================
--- gc_lang/fr/build.py
+++ gc_lang/fr/build.py
@@ -1,8 +1,9 @@
 # Builder for French language
 
 import os
+import platform
 import zipfile
 from distutils import dir_util, file_util
 
 import helpers
 
@@ -88,11 +89,12 @@
     for sp in os.listdir(spDict):
         if os.path.isdir(spDict+"/"+sp):
             hZip.write(spDict+"/"+sp+"/"+sp+".dic", "content/dictionaries/"+sp+"/"+sp+".dic")
             hZip.write(spDict+"/"+sp+"/"+sp+".aff", "content/dictionaries/"+sp+"/"+sp+".aff")
     hZip.close()
-    helpers.unzip(spfZip, dVars['tb_debug_extension_path'])
+    spfDebugProfile = dVars['win_tb_debug_extension_path']  if platform.system() == "Windows"  else dVars['linux_tb_debug_extension_path']
+    helpers.unzip(spfZip, spfDebugProfile)
 
 
 def _createOptionsForThunderbird (dVars):
     dVars['sXULTabs'] = ""
     dVars['sXULTabPanels'] = ""

Index: gc_lang/fr/config.ini
==================================================================
--- gc_lang/fr/config.ini
+++ gc_lang/fr/config.ini
@@ -43,15 +43,15 @@
 win_fx_dev_path = C:\Program Files\Firefox Developer Edition\firefox.exe
 win_fx_nightly_path = C:\Program Files\Nightly\firefox.exe
 linux_fx_dev_path = /usr/bin/firefox
 linux_fx_nightly_path = /usr/bin/firefox
 
-
 # Thunderbird
 tb_identifier = French-GC-TB@grammalecte.net
 tb_name = Grammalecte [fr]
-tb_debug_extension_path = _build/tb-debug.profile/extensions/French-GC-TB@grammalecte.net
+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
 # 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