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Extension Guide

The browser extension makes it easy to install and manage Progressive Web Apps directly from your main Firefox installation. It supports installing PWAs with just a few clicks, managing and launching them, and creating and managing profiles directly from the browser.



When the extension is installed, it will automatically open a new tab with instructions for setting up the project. This includes accepting the license agreement, installing the native program, and installing runtime. The instructions are provided in a form of an easy-to-follow wizard. Once the process is completed, you can start using the extension.

Installing a Web App

When a website is a valid PWA (loaded over HTTPS and has a linked web app manifest), the option to install it will automatically appear in the address bar (unless disabled in the extension settings). Clicking on it will bring up a popup menu, from which you can install the web app.

If the website is not a valid PWA, the installation action will not appear (unless enabled in the extension settings). However, you can still install such websites using the extension's browser action. This method does not require a web app manifest and can be used for any website.


If the installation fails because of a manifest-related error, you can try disabling the use of manifest for determining the app properties and installing it again.

Some websites cannot be installed because they use invalid manifests. We maintain a list of those websites.


You cannot re-use the same name for multiple web apps, because newer ones can overwrite menu entries for existing web apps. You should also be careful not to re-use the name of an existing native app, because it can also overwrite its menu entry.

You cannot install multiple instances of the same web app in the same profile, because they would actually be the same instance. Instead, install each instance into a separate profile.

Launching a Web App

When you open a website that has already been installed, the launch action will appear in your address bar. When you click on it, the popup will appear where you can launch existing instances of the web app or create a new one.

You can also launch the web app through system start/app menus, or from the web app list in the extension's browser action.

Profile Management

Web apps use a separate profile system from the normal Firefox, so data such as installed extensions, passwords, logins, etc. are not shared with your normal browser profile. This is used to make web apps more reliable and allow additional customization. If you want to sync data between your main and web app profile, it is recommended to use Firefox Account or a third-party sync solution.

By default, web apps are installed to a common "default" profile. You can also create separate isolated profiles and install web apps there, which allows you to install multiple instances of the same web app with different accounts. When installing a new web app, you also have an option to automatically create a new profile just for it.

All profiles can be accessed and managed through the "profiles" tab in the extension. You can check a list of most available profile properties and settings.

If the template option is specified, all contents of the provided template directory will be copied to a newly-created profile. This is useful if you want to create a new profile with the same extensions, settings, etc. as an existing one. If the template option is not specified, the new profile will use the default template that can be set in the extension settings.

A template can also be optionally applied later when editing the profile.


If you want to use an existing profile as a template, make sure it is not running before copying as a template. Otherwise, it will contain lock files that can cause errors when creating or running a profile from template. You can check FAQ for more details.

Web App Management

Installed web apps can be viewed and managed in the "web apps" tab in the extension. It allows you to launch, edit and uninstall web apps.

When editing a web app, you can change its properties, such as name, description and icon. Unless disabled, editing a web app also updates its manifest and icon, as well as re-apply the system integration. You can also check a list of most available web app properties and settings.

Editing a web app allows you to change which of the supported protocol handlers you want to be enabled. By default, all protocol handlers specified in the web app manifest are disabled. Some websites also dynamically register protocol handlers; those are enabled automatically if you accept the Firefox prompt.

You can also customize when the web app will launch automatically.

Extension Settings

Display address bar widget

When "On valid progressive web apps" is set (default), the address bar widget will only be displayed when the current website is a valid PWA (loaded over HTTPS and has a linked web app manifest). The other two options are self-explanatory.

Launch web apps on active URLs

If enabled (default), when launching from the address bar widget, the web app will be launched on the current URL. If disabled, the web app will be launched on the default start URL.

Show a popup on extension updates

If enabled (default), a notification will be displayed when the extension is updated.

Enable automatic web app launching

If enabled, all URLs that match the scopes of your enabled web apps will be automatically launched as a web app.


This feature is experimental, may not work with all websites correctly, and may impact performance.

This option needs to be additionally enabled per web app in its settings, using the "Launch this web app on matching website" checkbox. Specific URLs can also be excluded from being automatically launched inside web apps with the exclusion regex option.

Additional browser permissions are required for this option to work. They will be requested automatically after enabling the option if they are not already permitted.

Always patch runtime and profile

If enabled, the runtime and profile will be patched every time the web app is launched. If disabled (default), they will only be patched when a new version is released.

This option does not apply to macOS, because patching is always required on that platform.

Use Wayland Display Server (Linux-only)

If enabled, the Firefox runtime will be instructed to use the Wayland display server. This is equivalent to setting the MOZ_ENABLE_WAYLAND environment variable to 1.

Use X Input Extension 2 (Linux-only)

If enabled, the Firefox runtime will be instructed to use the X Input Extension 2. This is equivalent to setting the MOZ_USE_XINPUT2 environment variable to 1.

Use XDG Desktop Portals (Linux-only)

If enabled, the Firefox runtime will be instructed to use XDG Desktop Portals. This is equivalent to setting the GTK_USE_PORTAL environment variable to 1.

Default profile template

If specified, the provided directory will be used as a profile template when creating all new profiles, unless a different template directory is explicitly set when creating a profile.

All contents of the provided template directory will be copied to a newly-created profile.

Automatic launching exclusion

If specified, any URLs that match the provided regex will be excluded from the automatic web app launching (will not automatically open inside a web app). This might be useful when a website has own "redirection" URLs that you do not want to open in a web app. This option only has an effect when automatic web app launching is enabled.


The extension is translated into multiple languages. You can select which one you want to use.


Translations are maintained by the community and may be incomplete or incorrect.

You can help to improve them on Crowdin.

Update web apps

This will download and parse manifests for all your web apps and register them again to the operating systems. Any changes in web app manifests will also be reflected on your system.

Alternatively, you can register all web apps to the operating system without performing any manifest updates. This can be used if you transferred your config file from another device.

Patch profiles and runtime

This will patch all profiles and runtime with the current globally installed version of patches.

This is useful after (re)installing a custom runtime, or if you are experiencing problems with web app launching.

Reinstall runtime

This will remove your current runtime and download the latest version from Mozilla. It will also replace any custom runtime that you manually downloaded.

This will not affect your main Firefox browser and will not remove any profiles or data.


This option may not work on all platforms that PWAsForFirefox supports, as Firefox does not provide pre-built packages for some platforms, and automatic installation for some platforms is too hard to implement. For those platforms, you need to manually (re)install the runtime.