diff --git a/network/web/firefox/actions.py b/network/web/firefox/actions.py
index 3728d19300..0c65240c8e 100644
--- a/network/web/firefox/actions.py
+++ b/network/web/firefox/actions.py
@@ -18,7 +18,10 @@ xpidir = "%s/xpi" % get.workDIR()
 arch = get.ARCH()
 ver = ".".join(get.srcVERSION().split(".")[:3])
 
-jobs = jobs = "-j"+ subprocess.check_output("nproc 2>/dev/null", shell=True).rstrip("\n")
+
+# jobs = jobs = "-j"+ subprocess.check_output("nproc 2>/dev/null", shell=True).rstrip("\n")
+jobs_number = subprocess.check_output("nproc 2>/dev/null", shell=True).rstrip("\n")
+
 
 shelltools.export("SHELL", "/bin/sh")
 shelltools.export("PYTHON", "/usr/bin/python3")
@@ -29,7 +32,7 @@ shelltools.export("MOZBUILD_STATE_PATH", "mozbuild")
 shelltools.system("export MOZ_NOSPAM=1")
 
 def setup():
-	
+
     shelltools.system("echo 'Instrumenting Firefox for PGO'")
     shelltools.system("cp mozconfig-inst .mozconfig")
 	
@@ -37,7 +40,7 @@ def setup():
     shelltools.echo("google_api_key", "AIzaSyBINKL31ZYd8W5byPuwTXYK6cEyoceGh6Y")
     pisitools.dosed(".mozconfig", "%%PWD%%", get.curDIR())
     pisitools.dosed(".mozconfig", "%%FILE%%", "google_api_key")
-    pisitools.dosed(".mozconfig", "##JOBCOUNT##", jobs)
+    pisitools.dosed(".mozconfig", "##JOBS##", jobs_number)
 
     # LOCALE
     shelltools.system("rm -rf langpack-ff/*/browser/defaults")
@@ -79,7 +82,7 @@ def build():
     #shelltools.echo("google_api_key", "AIzaSyBINKL31ZYd8W5byPuwTXYK6cEyoceGh6Y")
     pisitools.dosed(".mozconfig", "%%PWD%%", get.curDIR())
     pisitools.dosed(".mozconfig", "%%FILE%%", "google_api_key")
-    pisitools.dosed(".mozconfig", "##JOBCOUNT##", jobs)
+    pisitools.dosed(".mozconfig", "##JOBS##", jobs_number)
     #shelltools.system("../configure --prefix=/usr --libdir=/usr/lib --disable-strip --disable-install-strip")
     shelltools.system("./mach build")
 
diff --git a/network/web/firefox/files/mozconfig-inst b/network/web/firefox/files/mozconfig-inst
index 391755b5e4..ff50b82dcd 100644
--- a/network/web/firefox/files/mozconfig-inst
+++ b/network/web/firefox/files/mozconfig-inst
@@ -1,5 +1,5 @@
 . $topsrcdir/browser/config/mozconfig
-mk_add_options MOZ_MAKE_FLAGS="##JOBCOUNT##"
+mk_add_options MOZ_PARALLEL_BUILD=##JOBS##
 
 ac_add_options --prefix=/usr
 ac_add_options --enable-release
diff --git a/network/web/firefox/files/mozconfig-opt b/network/web/firefox/files/mozconfig-opt
index aa86751007..5c8cd7ced4 100644
--- a/network/web/firefox/files/mozconfig-opt
+++ b/network/web/firefox/files/mozconfig-opt
@@ -1,5 +1,5 @@
 . $topsrcdir/browser/config/mozconfig
-mk_add_options MOZ_MAKE_FLAGS="##JOBCOUNT##"
+mk_add_options MOZ_PARALLEL_BUILD=##JOBS##
 
 ac_add_options --prefix=/usr
 ac_add_options --enable-release
diff --git a/network/web/firefox/files/pisilinux/distribution.ini b/network/web/firefox/files/pisilinux/distribution.ini
index e01e91414c..dcc9c12ca0 100644
--- a/network/web/firefox/files/pisilinux/distribution.ini
+++ b/network/web/firefox/files/pisilinux/distribution.ini
@@ -1,6 +1,6 @@
 [Global]
 id=PisiLinux
-version=2.4
+version=2.4.1
 about=Mozilla Firefox for PisiLinux
 
 [Preferences]
diff --git a/network/web/firefox/pspec.xml b/network/web/firefox/pspec.xml
index 32f554792d..7029b453aa 100644
--- a/network/web/firefox/pspec.xml
+++ b/network/web/firefox/pspec.xml
@@ -15,7 +15,7 @@
         <IsA>app:gui</IsA>
         <Summary>Firefox Web Browser</Summary>
         <Description>It is more secure and faster to browse the web with Firefox web browser. You can personalize your web browser with many specifications that is not enough to explain in two sentences.</Description>
-        <Archive sha1sum="ca595bf13bb0466def1ac3e0d2b69a70b3ae472c" type="tarxz">https://ftp.mozilla.org/pub/firefox/releases/138.0.4/source/firefox-138.0.4.source.tar.xz</Archive>
+        <Archive sha1sum="cf575a8a41189042fe38d4b8bb70c6889efd62e4" type="tarxz">https://ftp.mozilla.org/pub/firefox/releases/139.0/source/firefox-139.0.source.tar.xz</Archive>
         <AdditionalFiles>
             <!--Our main configure script. Configure paramters are stored here.-->
 <!--             <AdditionalFile target=".mozconfig" permission="0644">mozconfig</AdditionalFile> -->
@@ -567,6 +567,13 @@
     </Package>
 
     <History>
+        <Update release="151">
+            <Date>2025-05-26</Date>
+            <Version>139.0</Version>
+            <Comment>Version bump.</Comment>
+            <Name>Pisi Linux Community</Name>
+            <Email>admin@pisilinux.org</Email>
+        </Update>
         <Update release="150">
             <Date>2025-05-18</Date>
             <Version>138.0.4</Version>