[ULTIMATE GUIDE] How To Use WhatsApp On Web Through Firefox

I was excited - like most
when WhatsApp announced
the possibility to message
through the a web browser.
When I actually got round to
try it, was disappointed that it was only possible through
Google Chrome.
I took it upon myself to either
find a way or create a way
and something as simple as
changing the useragent didn't help.
Finally stumbled upon
something on reddit from
user 'Anctar';

Originally Posted by Anctar on Reddit So I tried to make a
workaround for those two
missing features with a
userscript. getUserMedia is
already partially supported
by Firefox and I simply had to make the method work
without the prefix. For the
Filesystem API I used a polyfill
from GitHub. The result is that
I can now use the webapp
with Firefox and I didn't run into any problems as of yet.
That being said I didn't do
much except simple chatting.
tl;dr: Install this userscript and set the useragent with an
addon of your choice to one
matching Chrome's and you
can use the client with
Firefox.
Edit: Use at own risk. Don't blame me if something
breaks or anything
unforeseen should happen.

For those that need it
breaking down, you will
need the following;
1) Firefox browser (maybe
others work, not sure)

2) Greasemonkey - Download here

3) An addon which changes
useragent - or manually
change it. - This you can research.

- Once you've downloaded
Greasemonkey, go the page
with the userscript mentioned
above (from here )
- Copy Either the text from the
link

- Thereafter go to add-ons
and greasemonkey, click on
New User Script (found on
top, quite small text) and then a dialogue box will
open. In the dialogue box at
the bottom it will say 'Use
script from clipboard'.

- Click save.

-Finally don't forget to change the userscript to
chrome and you're good to
go.
If you have any prob regarding this tutorial , feel free to drop comment