--- a/browser/branding/aurora/branding.nsi
+++ b/browser/branding/aurora/branding.nsi
@@ -10,18 +10,18 @@
 # instead of BrandFullName and typically should not be modified.
 !define BrandFullNameInternal "Firefox Developer Edition"
 !define BrandShortName        "Firefox Developer Edition"
 !define BrandFullName         "Firefox Developer Edition"
 !define CompanyName           "mozilla.org"
 !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"
 
 # The installer's certificate name and issuer expected by the stub installer
 !define CertNameDownload   "Mozilla Corporation"
 !define CertIssuerDownload "DigiCert SHA2 Assured ID Code Signing CA"
 

--- a/browser/branding/nightly/branding.nsi
+++ b/browser/branding/nightly/branding.nsi
@@ -9,18 +9,18 @@
 # BrandFullNameInternal is used for some registry and file system values
 # instead of BrandFullName and typically should not be modified.
 !define BrandFullNameInternal "Nightly"
 !define BrandFullName         "Firefox Nightly"
 !define CompanyName           "mozilla.org"
 !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"
 
 # The installer's certificate name and issuer expected by the stub installer
 !define CertNameDownload   "Mozilla Corporation"
 !define CertIssuerDownload "DigiCert SHA2 Assured ID Code Signing CA"
 

--- a/browser/branding/official/branding.nsi
+++ b/browser/branding/official/branding.nsi
@@ -14,18 +14,18 @@
 !define URLInfoAbout          "https://www.mozilla.org"
 !define URLUpdateInfo         "https://www.mozilla.org/firefox/${AppVersion}/releasenotes"
 !define HelpLink              "https://support.mozilla.org"
 
 ; The OFFICIAL define is a workaround to support different urls for Release and
 ; 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"
 
 # The installer's certificate name and issuer expected by the stub installer
 !define CertNameDownload   "Mozilla Corporation"
 !define CertIssuerDownload "DigiCert SHA2 Assured ID Code Signing CA"
 

--- a/browser/branding/unofficial/branding.nsi
+++ b/browser/branding/unofficial/branding.nsi
@@ -9,18 +9,18 @@
 # BrandFullNameInternal is used for some registry and file system values
 # instead of BrandFullName and typically should not be modified.
 !define BrandFullNameInternal "Mozilla Developer Preview"
 !define BrandFullName         "Mozilla Developer Preview"
 !define CompanyName           "mozilla.org"
 !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"
 
 # The installer's certificate name and issuer expected by the stub installer
 !define CertNameDownload   "Mozilla Corporation"
 !define CertIssuerDownload "DigiCert SHA2 Assured ID Code Signing CA"
 

--- a/browser/installer/windows/nsis/stub.nsi
+++ b/browser/installer/windows/nsis/stub.nsi
@@ -232,18 +232,18 @@ Var AppLaunchWaitTickCount
 
 ; The OFFICIAL define is a workaround to support different urls for Release and
 ; Beta since they share the same branding when building with other branches that
 ; set the update channel to beta.
 !ifdef OFFICIAL
 !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
 !define Channel "beta"
 !endif
 !endif
 
 !undef INSTALL_BLURB_TEXT_COLOR