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 @@ #---------------------------------------------------------------------

%changelog +* Fri Nov 18 2016 Alice Wonder buildmaster@librelamp.com - 50.0-1.0 +- Build for CentOS 7, disable UA patch + * Thu Nov 10 2016 Martin Stransky stransky@redhat.com - 50.0-1 - Update to 50.0

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

nss in CentOS is too old so that has to be disabled. Hardened build works so I change the detection macro to trigger

The UA patch I disable for privacy reasons. Including the distribution does not convey meaningful information to a website, it only adds a characteristic that helps with fingerprinting. So I don't apply that patch, X11 Linux in the UA string is enough information on its own.

Hope this is helpful to someone, but of course remember that when CentOS is using an older version, you won't benefit from security patch updates to CentOS. Have to watch Fedora to know when its time to download another src.rpm that includes the fixes. So only use this over CentOS FireFox if you really need it.