No idea who this will be useful for, but starting with FireFox 49 I have been running a modern FireFox with CentOS 7.

I needed to in order to play with the new Service Worker based Push API
but it has other things FireFox 45 ESR doesn’t have – such as working html5 details/summary tags – which I make us when a page needs a Table of Contents, for example.

Anyway I start with Fedora src.rpm and build it in mock on my system. Here are the changes I made to Fedora spec file for FireFox 50:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
— firefox.spec.orig 2016-11-18 12:31:02.963164405 -0800
+++ firefox.spec 2016-11-18 12:50:16.068918152 -0800
@@ -1,5 +1,5 @@
# Use system nspr/nss?
-%define system_nss 1
+%define system_nss 0

# Use system sqlite?
%if 0%{?fedora} > 23
@@ -27,7 +27,7 @@
%endif

# Hardened build?
-%if 0%{?fedora} > 20
+%if 0%{?fedora} > 20 || 0%{?rhel} > 6
%define hardened_build 1
%else
%define hardened_build 0
@@ -94,7 +94,7 @@
Summary: Mozilla Firefox Web browser
Name: firefox
Version: 50.0
-Release: 1%{?pre_tag}%{?dist}
+Release: 1%{?pre_tag}%{?dist}.0
URL: https://www.mozilla.org/firefox/
License: MPLv1.1 or GPLv2+ or LGPLv2+
Group: Applications/Internet
@@ -127,7 +127,7 @@
Patch204: rhbz-966424.patch
Patch215: firefox-enable-addons.patch
Patch219: rhbz-1173156.patch
-Patch221: firefox-fedora-ua.patch
+#Patch221: firefox-fedora-ua.patch
Patch223: rhbz-1291190-appchooser-crash.patch
Patch224: mozilla-1170092.patch
Patch225: mozilla-1005640-accept-lang.patch
@@ -269,7 +269,7 @@
%patch204 -p2 -b .966424
%patch215 -p1 -b .addons
%patch219 -p2 -b .rhbz-1173156
-%patch221 -p2 -b .fedora-ua
+#%%patch221 -p2 -b .fedora-ua
%if 0%{?fedora} > 22
%patch223 -p1 -b .appchooser-crash
%endif
@@ -786,6 +786,9 @@
#——————————————————————-