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About the developer

9.7K Stars 2.3K Forks Mozilla Public License 2.0 8.5K Commits 693 Opened issues


Firefox for iOS

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Contributors list

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Download on the App Store.

This branch (main)

This branch only works with Xcode 11.5, Swift 5.2 and supports iOS 12.0 and above.

Please make sure you aim your pull requests in the right direction.

For bug fixes and features for a specific release use the version branch.

Getting involved

Want to contribute but don't know where to start? Here is a list of issues that are contributor friendly

Building the code

  1. Install the latest Xcode developer tools from Apple.
  2. Install Carthage and Node
    brew update
    brew install carthage
    brew install node
  3. Clone the repository:
    git clone
  4. Pull in the project dependencies:
    cd firefox-ios
    sh ./
  5. Open
    in Xcode.
  6. Build the
    scheme in Xcode.

Building User Scripts

User Scripts (JavaScript injected into the

) are compiled, concatenated and minified using webpack. User Scripts to be aggregated are placed in the following directories:
|-- /Frontend
    |-- /UserContent
        |-- /UserScripts
            |-- /AllFrames
            |   |-- /AtDocumentEnd
            |   |-- /AtDocumentStart
            |-- /MainFrame
                |-- /AtDocumentEnd
                |-- /AtDocumentStart

This reduces the total possible number of User Scripts down to four. The compiled output from concatenating and minifying the User Scripts placed in these folders resides in

and are named accordingly:
  • AllFramesAtDocumentEnd.js
  • AllFramesAtDocumentStart.js
  • MainFrameAtDocumentEnd.js
  • MainFrameAtDocumentStart.js

To simplify the build process, these compiled files are checked-in to this repository. When adding or editing User Scripts, these files can be re-compiled with

manually. This requires Node.js to be installed and all required
packages can be installed by running
npm install
in the root directory of the project. User Scripts can be compiled by running the following
command in the root directory of the project:
npm run build


Want to contribute to this repository? Check out Contributing Guidelines

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