DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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An explanation of the Mozilla Source Code Directory Structure and links to
project pages with documentation can be found at:


For information on how to build Mozilla from the source code, see:


To have your bug fix / feature added to Mozilla, you should create a patch and
submit it to Bugzilla (https://bugzilla.mozilla.org). Instructions are at:


If you have a question about developing Mozilla, and can't find the solution
on https://developer.mozilla.org, you can try asking your question in a
mozilla.* Usenet group, or on IRC at irc.mozilla.org. [The Mozilla news groups
are accessible on Google Groups, or news.mozilla.org with a NNTP reader.]

Nightly development builds can be downloaded from:

            - or -

Keep in mind that nightly builds, which are used by Mozilla developers for
testing, may be buggy.