diff --git a/SOURCES/thunderbird-redhat-default-prefs.js.rhel6 b/SOURCES/thunderbird-redhat-default-prefs.js.rhel6
deleted file mode 100644
index 26e8d17..0000000
--- a/SOURCES/thunderbird-redhat-default-prefs.js.rhel6
+++ /dev/null
@@ -1,33 +0,0 @@
-pref("app.update.enabled", false);
-pref("app.update.autoInstallEnabled", false);
-# Allow users to set custom colors
-# pref("browser.display.use_system_colors",   true);
-pref("general.useragent.vendor", "Red Hat");
-pref("general.useragent.vendorSub", "THUNDERBIRD_RPM_VR");
-pref("intl.locale.matchOS", true);
-pref("mail.shell.checkDefaultClient", false);
-pref("toolkit.networkmanager.disable", false);
-pref("offline.autoDetect", true);
-
-# Disable global indexing by default
-pref("mailnews.database.global.indexer.enabled", false);
-
-# Do not switch to Smart Folders after upgrade to 3.0b4
-pref("mail.folder.views.version", "1");
-pref("extensions.shownSelectionUI", true);
-pref("extensions.autoDisableScope", 0);
-
-# For rhbz#1024232
-pref("ui.SpellCheckerUnderlineStyle",       1);
-
-/* Workaround for rhbz#1134876 */
-pref("javascript.options.baselinejit",      false);
-/* Workaround for rhbz#1110291 */
-pref("network.negotiate-auth.allow-insecure-ntlm-v1", true);
-/* Workaround for mozbz#1063315 */
-pref("security.use_mozillapkix_verification", false);
-/* Use OS settings for UI language */
-pref("intl.locale.requested", "");
-pref("datareporting.healthreport.uploadEnabled", false);
-pref("datareporting.policy.dataSubmissionEnabled", false);
-pref("toolkit.telemetry.archive.enabled", false);
diff --git a/SOURCES/thunderbird-redhat-default-prefs.js.rhel7 b/SOURCES/thunderbird-redhat-default-prefs.js.rhel7
deleted file mode 100644
index 26e8d17..0000000
--- a/SOURCES/thunderbird-redhat-default-prefs.js.rhel7
+++ /dev/null
@@ -1,33 +0,0 @@
-pref("app.update.enabled", false);
-pref("app.update.autoInstallEnabled", false);
-# Allow users to set custom colors
-# pref("browser.display.use_system_colors",   true);
-pref("general.useragent.vendor", "Red Hat");
-pref("general.useragent.vendorSub", "THUNDERBIRD_RPM_VR");
-pref("intl.locale.matchOS", true);
-pref("mail.shell.checkDefaultClient", false);
-pref("toolkit.networkmanager.disable", false);
-pref("offline.autoDetect", true);
-
-# Disable global indexing by default
-pref("mailnews.database.global.indexer.enabled", false);
-
-# Do not switch to Smart Folders after upgrade to 3.0b4
-pref("mail.folder.views.version", "1");
-pref("extensions.shownSelectionUI", true);
-pref("extensions.autoDisableScope", 0);
-
-# For rhbz#1024232
-pref("ui.SpellCheckerUnderlineStyle",       1);
-
-/* Workaround for rhbz#1134876 */
-pref("javascript.options.baselinejit",      false);
-/* Workaround for rhbz#1110291 */
-pref("network.negotiate-auth.allow-insecure-ntlm-v1", true);
-/* Workaround for mozbz#1063315 */
-pref("security.use_mozillapkix_verification", false);
-/* Use OS settings for UI language */
-pref("intl.locale.requested", "");
-pref("datareporting.healthreport.uploadEnabled", false);
-pref("datareporting.policy.dataSubmissionEnabled", false);
-pref("toolkit.telemetry.archive.enabled", false);
diff --git a/SPECS/thunderbird.spec b/SPECS/thunderbird.spec
index cf8c397..fb8d3dc 100644
--- a/SPECS/thunderbird.spec
+++ b/SPECS/thunderbird.spec
@@ -234,8 +234,8 @@ Source301:      yasm-1.2.0-3.el5.src.rpm
 Source303:      libffi-3.0.13-18.el7_3.src.rpm
 Source304:      nodejs-10.21.0-5.fc32.src.rpm
 Source305:      openssl-1.0.2k-19.6.bundle.el7_7.src.rpm
-Source601:      thunderbird-redhat-default-prefs.js.rhel6
-Source701:      thunderbird-redhat-default-prefs.js.rhel7
+Source601:      thunderbird-centos-default-prefs.js.el6
+Source701:      thunderbird-centos-default-prefs.js.el7
 
 ## Firefox patches