diff --git a/browser/branding/aurora/branding.nsi b/browser/branding/aurora/branding.nsi
index b6e122dc369f9..abe2bc774a465 100644
--- a/browser/branding/aurora/branding.nsi
+++ b/browser/branding/aurora/branding.nsi
@@ -15,8 +15,8 @@
 !define URLInfoAbout          "https://www.mozilla.org"
 !define HelpLink              "https://support.mozilla.org"
 
-!define URLStubDownload32 "http://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-devedition-latest"
-!define URLStubDownload64 "http://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-devedition-latest"
+!define URLStubDownload32 "https://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-devedition-latest"
+!define URLStubDownload64 "https://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-devedition-latest"
 !define URLManualDownload "https://www.mozilla.org/${AB_CD}/firefox/installer-help/?channel=aurora&installer_lang=${AB_CD}"
 !define URLSystemRequirements "https://www.mozilla.org/firefox/system-requirements/"
 !define Channel "aurora"
diff --git a/browser/branding/nightly/branding.nsi b/browser/branding/nightly/branding.nsi
index f8392948b8130..84d6d910b69d0 100644
--- a/browser/branding/nightly/branding.nsi
+++ b/browser/branding/nightly/branding.nsi
@@ -14,8 +14,8 @@
 !define URLInfoAbout          "https://www.mozilla.org"
 !define HelpLink              "https://support.mozilla.org"
 
-!define URLStubDownload32 "http://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-nightly-latest"
-!define URLStubDownload64 "http://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-nightly-latest"
+!define URLStubDownload32 "https://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-nightly-latest"
+!define URLStubDownload64 "https://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-nightly-latest"
 !define URLManualDownload "https://www.mozilla.org/${AB_CD}/firefox/installer-help/?channel=nightly&installer_lang=${AB_CD}"
 !define URLSystemRequirements "https://www.mozilla.org/firefox/system-requirements/"
 !define Channel "nightly"
diff --git a/browser/branding/official/branding.nsi b/browser/branding/official/branding.nsi
index ba248218e74cd..6d2c1db4d426b 100644
--- a/browser/branding/official/branding.nsi
+++ b/browser/branding/official/branding.nsi
@@ -19,8 +19,8 @@
 ; Beta since they share the same branding when building with other branches that
 ; set the update channel to beta.
 !define OFFICIAL
-!define URLStubDownload32 "http://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-latest"
-!define URLStubDownload64 "http://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-latest"
+!define URLStubDownload32 "https://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-latest"
+!define URLStubDownload64 "https://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-latest"
 !define URLManualDownload "https://www.mozilla.org/${AB_CD}/firefox/installer-help/?channel=release&installer_lang=${AB_CD}"
 !define URLSystemRequirements "https://www.mozilla.org/firefox/system-requirements/"
 !define Channel "release"
diff --git a/browser/branding/unofficial/branding.nsi b/browser/branding/unofficial/branding.nsi
index 257507542126a..99312f2df5f29 100644
--- a/browser/branding/unofficial/branding.nsi
+++ b/browser/branding/unofficial/branding.nsi
@@ -14,8 +14,8 @@
 !define URLInfoAbout          "https://www.mozilla.org"
 !define HelpLink              "https://support.mozilla.org"
 
-!define URLStubDownload32 "http://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-latest"
-!define URLStubDownload64 "http://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-latest"
+!define URLStubDownload32 "https://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-latest"
+!define URLStubDownload64 "https://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-latest"
 !define URLManualDownload "https://www.mozilla.org/${AB_CD}/firefox/installer-help/?channel=release&installer_lang=${AB_CD}"
 !define URLSystemRequirements "https://www.mozilla.org/firefox/system-requirements/"
 !define Channel "unofficial"
diff --git a/browser/installer/windows/nsis/stub.nsi b/browser/installer/windows/nsis/stub.nsi
index 6ec7699e58643..110566b786d6f 100644
--- a/browser/installer/windows/nsis/stub.nsi
+++ b/browser/installer/windows/nsis/stub.nsi
@@ -237,8 +237,8 @@ Var AppLaunchWaitTickCount
 !ifdef BETA_UPDATE_CHANNEL
 !undef URLStubDownload32
 !undef URLStubDownload64
-!define URLStubDownload32 "http://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-beta-latest"
-!define URLStubDownload64 "http://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-beta-latest"
+!define URLStubDownload32 "https://download.mozilla.org/?os=win&lang=${AB_CD}&product=firefox-beta-latest"
+!define URLStubDownload64 "https://download.mozilla.org/?os=win64&lang=${AB_CD}&product=firefox-beta-latest"
 !undef URLManualDownload
 !define URLManualDownload "https://www.mozilla.org/${AB_CD}/firefox/installer-help/?channel=beta&installer_lang=${AB_CD}"
 !undef Channel