Creating my first Firefox patch

In creating my first Firefox patch I struggled a bit to put everything together.
These are the steps I followed:

1. Configure mercurial

Add this settings to ~/.hgrc

username = Diogo Golovanevsky Monteiro [email protected]
ui.merge = meld

git = 1
showfunc = 1
unified = 8

diff = -p -U 8
qdiff = -p -U 8
qnew = -U
commit = -v

mq =

2. Clone Mozilla’s repo

hg clone src

3. Make changes to the code

4. Create a new patch

hg qnew -f bug-1234

5. Make sure you are in the right patch

hg qtop

6. Enter a commit message to the patch

hg qrefresh -m “Bug 1234 – bug description”

7. Make sure the patch applies cleanly

hg qpop -a
hg pull
hg update
hg qpush

The patch will be saved in /repoRoot/.hg/patches/patchName

For a more detail explanation:
Getting Mozilla Source Code Using Mercurial
How to Submit a Patch
Creating a patch
Using Mercurial
Mercurial Queues