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Like many large software projects, Tor Browser integrates many distinct codebases.
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# Tor Browser
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[Repository](https://gitlab.torproject.org/tpo/applications/tor-browser)
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Tor Browser is based on Firefox, and this repository contains our fork of Mozilla's [mozilla-central](https://hg.mozilla.org/mozilla-central/).
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From this code, we build both Tor Browser for desktop (TBB, Tor Browser Bundle) and [GeckoView](https://mozilla.github.io/geckoview/), which is the rendering engine for Tor Browser for Android (TBA).
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Every time a new Firefox version is released, we create four new branches on this project, then we reapply our patch set on top of it.
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Therefore, the repository does not have a mainline, and we work concurrently on four branches:
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1. Tor Browser stable for desktop
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2. Tor Browser alpha for desktop
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3. Geckoview stable
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4. Geckoview alpha
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While Mozilla keeps the codebase for Firefox and GeckoView united, we keep it separate for some reasons:
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* desktop is based on the ESR channel, Android on the rapid release one;
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* while many patches are the same, others are incompatible between the two platforms or are implemented differently because of architectural differences.
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# Torbutton
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[Repository](https://gitlab.torproject.org/tpo/applications/torbutton)
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Torbutton is the component in Tor Browser that takes care of application-level security and privacy concerns in Firefox.
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It was born as a Firefox addon, but now it is a built-in extension.
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# Tor Launcher
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[Repository](https://gitlab.torproject.org/tpo/applications/tor-launcher)
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Tor Launcher controls the Tor process underlying the browser networking.
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It was born as an addon and also provided the network configuration UI. Now it is a built-in extension, and the configuration UI has been moved into the Tor Browser repository.
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_Not to be confused with torbrowser-launcher, which is not an Application Team's project._
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# Fenix
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[Repository](https://gitlab.torproject.org/tpo/applications/fenix)
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Fenix is the codename of Firefox for Android. This repository contains the code to build Tor Browser Android from the patched GeckoView and Android Components.
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Like other repositories, it does not have a mainline. Each branch is a version released by Mozilla, with our patch set applied.
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# Android Components
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[Repository](https://gitlab.torproject.org/tpo/applications/android-components)
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[Mozilla Android Components](https://mozac.org/) is a collection of independent, reusable Android library components to make it easier to build browsers and browser-like applications.
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It is another of the pieces used to build TBA.
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Like Fenix and GeckoView, each branch is a MozAC version, plus Tor Browser patches.
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# Tor Android Service
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[Repository](https://gitweb.torproject.org/tor-android-service.git/)
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It is the Tor controller for Android.
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# Tor Browser Build
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[Repository](https://gitlab.torproject.org/tpo/applications/tor-browser-build)
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It is the repository we use to create reproducible builds of Tor Browser for desktop and Android and manage all their dependencies.
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It is based on [RBM (Reproducible Build System)](https://rbm.torproject.org/).
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# Tor Browser Bundle Testsuite
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[Repository](https://gitlab.torproject.org/tpo/applications/tor-browser-bundle-testsuite)
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It contains a test suite for Tor Browser. |
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\ No newline at end of file |
