Index: xsoft/graphweb/firefox.xml
===================================================================
--- xsoft/graphweb/firefox.xml (revision 0590db71d3716e96f93a4355be2d83f29f88406b)
+++ xsoft/graphweb/firefox.xml (revision 3f54026d8d0170433d046511bfeeb33a80553011)
@@ -333,5 +333,6 @@
-./mach build
+patch -Np1 -i ../firefox-&firefox-version;-ffmpeg4.0-1.patch &&
+./mach build