Building Firefox form source code in Slackware

Hi,

I have Slackware 14.2. I want build from source code firefox
76.0. Original version in Slackware is 68.7.0esr. this is the first
attempt about build Firefox.

I started by reading this article
https://developer.mozilla.org/.../Linu...S_build_prepa...

I have 64 bit system, this is OK
Original version of Python in Slackware is 2.7.17. It really is a must
have version 3. too?

The source code must be in the directory /home*?

Next step is download bootstrap.py script and save it to direcotory src.

After startup this script is source code downloaded? I have not
experience with mercurial or Git Therefore, I will use the default
values

Now let's go to the directory mozzila-central. Where is this
directory, in source code? I have not special I have no special
requirements. I will not create .mozconfig file. Is it OK?

Now compilation can begin. I will use command ./mach build

*Can be source code located in /usr/ports directory. I want to create
in the future some similar FreeBSD port system.

The last question, where i can find list of librarry which Firefox
use? Something like this
http://www.linuxfromscratch.org/.../vi...t/firefox.html

Thank you for your patience

Petr