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Install or upgrade


For the graphical interface, we provide a simple installation process:


The original command line tool, mozregression, is a Python (3.6+) package installable via pip. You can find it on pypi, as mozregression.

Note that you will need a reasonably current version of pip to install mozregression to be able to download the Glean dependency. If you get any errors installing Glean and you have an older Python, try upgrading your local copy of pip (Why you really need to upgrade pip might be helpful for Linux users).


If you have an existing Firefox source checkout, you can install and use mozregression via mach. For example:

./mach mozregression --help