diff --git a/packages/thunderbird-config.xml b/packages/thunderbird-config.xml
index f0ca0f6..6eb82c0 100644
--- a/packages/thunderbird-config.xml
+++ b/packages/thunderbird-config.xml
@@ -8,7 +8,7 @@
 
         <depends package-id="thunderbird" />
 
-        <variable name='PKG_VERSION' value='5' />
+        <variable name='PKG_VERSION' value='6' />
         <variable architecture='x86' name='PROG' value='%PROGRAMFILES%\Mozilla Thunderbird' />
         <variable architecture='x64' name='PROG' value='%PROGRAMFILES(x86)%\Mozilla Thunderbird' />
         <variable architecture='x86' name='REG_PATH' value='HKLM\Software\Mozilla\Thunderbird' />
@@ -18,6 +18,7 @@
 
         <install cmd='%COMSPEC% /C copy /Y "%SOFTWARE%\thunderbird\autoconf.js" "%PROG%\defaults\pref\"' />
         <install cmd='%COMSPEC% /C copy /Y "%SETTINGS%\thunderbird\thunderbird.cfg" "%PROG%\"' />
+        <install cmd='%COMSPEC% /C copy /Y "%SETTINGS%\thunderbird\custom-strings.txt" "%PROG%\chrome\"' />
         <install cmd='%COMSPEC% /C reg add "%REG_PATH%" /v "ConfigRevision" /t REG_SZ /d "%PKG_VERSION%" /f' />
 
         <upgrade include="install" />
diff --git a/softwares/custom-strings.txt b/softwares/custom-strings.txt
new file mode 100644
index 0000000..da230b2
--- /dev/null
+++ b/softwares/custom-strings.txt
@@ -0,0 +1 @@
+chrome%3A//messenger/locale/messengercompose/composeMsgs.properties#cloudAttachmentListFooter=<small>Partagez facilement vos documents avec <a href=http://www.ipasserelle.com/><b>iPasserelle</b>&#8482;</a></small>