First, let's **[download the latest tarball](https://gitlab.com/librewolf-community/browser/source/-/jobs/artifacts/main/raw/librewolf-99.0-1.source.tar.gz?job=Build)**. This tarball is the latest produced by the [CI](https://gitlab.com/librewolf-community/browser/source/-/jobs). You can also check the sha256sum of the tarball there.
Now that you have a patch in LibreWolf, that's not enough to upload to Mozilla. See, Mozilla only accepts patches against Nightly. So here is how to do that:
Time to start hacking! You should join us on [Matrix](https://chat.mozilla.org/), say hello in the [Introduction channel](https://chat.mozilla.org/#/room/#introduction:mozilla.org), and [find a bug to start working on](https://codetribute.mozilla.org/). See the [Firefox Contributors’ Quick Reference](https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html#firefox-contributors-quick-reference) to learn how to test your changes, send patches to Mozilla, update your source code locally, and more.
We understand, life isn't always fair 😺. The same steps as above do apply, you'll just have to walk through the beginning part of the guides for [MacOS](https://firefox-source-docs.mozilla.org/setup/macos_build.html), [Windows](https://firefox-source-docs.mozilla.org/setup/windows_build.html). To build on Windows is not very well tested. The cross-compiled Mac .dmg files are also relatively new. It should work, perhaps with the exception of the `make setup-wasi` step. Help testing with these targets is always welcome.