Hello Everyone,
Today we are going to learn how to download firefox builds from Mozilla HTTP Server.
Those who are new to Mozilla QA(Quality Assurance) they have to know how to download the correct build. So lets started with a bug from Bugzilla.

That’s a bug report looks like. Now we are studying this case as a demo. Don’t worry about the meaning of some terms like whiteboard, Target Milestone, Blocks etc. Now have a look on Reported & Platform terms.
The platform section indicates the Operating System and its architectural bit. In this case the OS could be anything (windows, linux etc) and it’s system type 64/32 bit.
The Reported Section indicates the date and time when the bug has been submitted to bugzilla. In this case the date is 25th of March, 2015. So to examine the bug we have to download a 32/86 bit build of that date. Here we are downloading a Firefox Nightly Build because in general we are verifying bugs in nightly build.
Mozilla has 4 Firefox Builds for desktop.
http://archive.mozilla.org/pub/firefox/
This is Mozilla HTTP server link. Now go to this link.
Now go to the nightly folder. Then go to the folder named 2015.
Then go to the folder named 03. (Here number indicates the month).
Then find the exact date folder. In our case it will be 2015-03-25-mozilla-central. (Note: Central=Nightly & Aurora=Developer Edition).
Go to the folder and search for the OS which you are currently worked on. I have Windows based operating system, so for this particular case I choose
“firefox-39.0a1.en-US.win32.zip”.
Extract the .zip file and you are ready to go.
Happy contributing 
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