Related: #1990543 package features/*.xpi only if any exist

78.13.0 removed the last and one and only
comm/mail/components/cloudfile/wetransfer/
so %files for %{mozappdir}/features/*.xpi failed with No such file

thunderbird.spec

@@ -171,6 +171,7 @@ end}
 %global mozappdirdev  %{_libdir}/%{name}-devel-%{version}
 %global langpackdir   %{mozappdir}/distribution/extensions
 %global tarballdir    %{name}-%{version}
+%global mozappfeatures %{mozappdir}/features/*.xpi
 #global pre_tag       alpha
 
 %global official_branding       1
@@ -1193,6 +1194,14 @@ echo "Adding following langpacks:"
 cat %{name}.lang
 %endif
 
+# Install feature extensions.
+echo > %{name}.features
+if [ -f "$(ls -1 %{mozappfeatures} | head -1)" ]; then
+    ls -1 %{mozappfeatures} >> %{name}.features
+    echo "Adding following features:"
+    cat %{name}.features
+fi
+
 # Get rid of devel package and its debugsymbols
 %{__rm} -rf %{buildroot}%{_libdir}/%{name}-devel-%{version}
 
@@ -1253,7 +1262,7 @@ update-desktop-database &> /dev/null || :
 gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 
 #===============================================================================
-%files -f %{name}.lang
+%files -f %{name}.lang -f %{name}.features
 %defattr(-,root,root,-)
 %attr(755,root,root) %{_bindir}/thunderbird
 %attr(644,root,root) %{_datadir}/applications/thunderbird.desktop
@@ -1276,7 +1285,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %{mozappdir}/*.so
 %{mozappdir}/platform.ini
 %{mozappdir}/application.ini
-%{mozappdir}/features/*.xpi
 %exclude %{mozappdir}/removed-files
 %{_datadir}/icons/hicolor/16x16/apps/thunderbird.png
 %{_datadir}/icons/hicolor/22x22/apps/thunderbird.png