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  2. lib/
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  4. tests/
  5. .npmignore
  6. .travis.yml
  7. gulpfile.js
  8. index.js
  10. package.json

node-firefox-find-ports Build Status

Find ports where debuggable runtimes are listening.

Install with NPM

This is part of the node-firefox project.

When runtimes have remote debugging enabled, they start a server that listens for incoming connections. Devices connected via USB can also have their remote debugging sockets forwarded to local TCP/IP ports by the Android Debug Bridge (adb).

This module can find these runtimes and in which port they are listening.


From git

git clone
cd node-firefox-find-ports
npm install

If you want to update later on:

cd node-firefox-find-ports
git pull origin master
npm install


npm install node-firefox-find-ports


findPorts(options) // returns a Promise

where options is a plain Object with any of the following:

  • firefox: look for Firefox Desktop instances
  • firefoxOSSimulator: look for Firefox OS Simulators
  • firefoxOSDevice: look for local ports forwarded to connected devices
  • ignoreMultiplePortsPerDevice: if there are multiple local ports forwarded to the same remote debugging port on a device, report only the first that is found (default: true)
  • detailed: query each found runtime for more information, such as the version, build time, processor, etc. The additional data will be added to the entry under a new device field.

If no options are provided, or if options is an empty Object ({}), then findPorts will look for any runtimes, of any type.

Finding ports

var findPorts = require('node-firefox-find-ports');

// Return all listening runtimes
findPorts().then(function(results) {

// Returns only Firefox OS simulators, this time with error handling
findPorts({ firefoxOSSimulator: true }).then(function(results) {
}, function(err) {

The output from the above code might look like the following:

[ { type: 'b2g', port: 56567, pid: 45876 },
  { type: 'firefox', port: 6000, pid: 3718 },
  { type: 'device', port: 8001, deviceId: '3739ced5' } ]

Use the detailed option for additional information:

// Returns only Firefox OS simulators, with extra detailed output
  firefoxOSSimulator: true, 
  firefoxOSDevice: true,
  detailed: true
}).then(function(results) {

Detailed output includes a lot more info:

[ { type: 'b2g',
    port: 56567,
    pid: 45876,
     { appid: '{3c2e2abc-06d4-11e1-ac3b-374f68613e61}',
       apptype: 'b2g',
       vendor: 'Mozilla',
       name: 'B2G',
       version: '',
       appbuildid: '20141123160201',
       platformbuildid: '20141123160201',
       platformversion: '36.0a1',
       geckobuildid: '20141123160201',
       geckoversion: '36.0a1',
       changeset: '8c02f3280d0c',
       useragent: 'Mozilla/5.0 (Mobile; rv:36.0) Gecko/20100101 Firefox/36.0',
       locale: 'en-US',
       os: 'B2G',
       hardware: null,
       processor: 'x86_64',
       compiler: 'gcc3',
       dpi: 258,
       brandName: null,
       channel: 'default',
       profile: 'profile',
       width: 1680,
       height: 1050 },
    release: '' },
  { type: 'device',
    port: 8001,
    deviceId: '3739ced5',
     { appid: '{3c2e2abc-06d4-11e1-ac3b-374f68613e61}',
       apptype: 'b2g',
       vendor: 'Mozilla',
       name: 'B2G',
       version: '',
       appbuildid: '20150320064705',
       platformbuildid: '20150320064705',
       platformversion: '39.0a1',
       geckobuildid: '20150320064705',
       geckoversion: '39.0a1',
       changeset: 'b2e71f32548f',
       locale: 'en-US',
       os: 'B2G',
       hardware: 'qcom',
       processor: 'arm',
       compiler: 'eabi',
       brandName: null,
       channel: 'nightly',
       profile: 'default',
       dpi: 254,
       useragent: 'Mozilla/5.0 (Mobile; rv:39.0) Gecko/39.0 Firefox/39.0',
       width: 320,
       height: 569 },
    release: '' } ]

Running the tests

After installing, you can simply run the following from the module folder:

npm test

To add a new unit test file, create a new file in the tests/unit folder. Any file that matches test.*.js will be run as a test by the appropriate test runner, based on the folder location.

We use gulp behind the scenes to run the test; if you don‘t have it installed globally you can use npm gulp from inside the project’s root folder to run gulp.

Code quality and style

Because we have multiple contributors working on our projects, we value consistent code styles. It makes it easier to read code written by many people! :-)

Our tests include unit tests as well as code quality (“linting”) tests that make sure our test pass a style guide and JSHint. Instead of submitting code with the wrong indentation or a different style, run the tests and you will be told where your code quality/style differs from ours and instructions on how to fix it.


This is based on initial work on fx-ports by Nicola Greco.

The command line utility binary has been removed for this initial iteration, since pretty much all the existing applications using this module were just using the JS code directly, not the binary.


This program is free software; it is distributed under an Apache License.


Copyright (c) 2014 Mozilla (Contributors).