You approach the coding of an extension for Firefox for Android in the same way as you would for a desktop extension; using a text editor or tool of your choice to write the code. However, when you want to test and debug your extension you need to follow a different process, this article walks you through that process.

Before running your extension on Firefox for Android, consider using web-ext lint. Lint performs a check to determine if any of the permissions, manifest keys, and web extension APIs you're using are incompatible with Firefox for Android. Lint relies on your extension's manifest.json file including strict_min_version values for the optional gecko and gecko_android sub-keys in browser_specific_settings. It then reports on the features that are not supported by the minimum version you have set.

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When setting strict_min_version values in browser_specific_settings, unless you're targeting a specific version of Firefox, choose the most recent version of Firefox you expect your extension to be compatible with. Due to Android's different APIs and form factors (compared to desktop Firefox), set gecko_android after explicitly verifying compatibility. This sub-key enables a compatibility range that is distinct from Firefox for desktop.

Before making your extension available, test it on Android to ensure it works as expected. When you publish it on AMO, reviewers may reject it or request changes if it doesn't meet basic usability requirements.

In the unzipped directory of your extension, run web-ext run -t firefox-android and follow the instructions on screen to make sure you select the right device. Select org.mozilla.fenix as the apkname (or org.mozilla.firefox_beta for Firefox Beta for Android).

Currently, you cannot inspect the markup of Fenix's browserAction popups using the Firefox Developer Tools Inspector (see bug 1637616). As a workaround, we recommend that you temporarily change the extension to open the popup extension page into a tab to be able to inspect it.

You can debug your extension in the web developer tools and view any manifest.json validation messages using adb logcat. To make use of these features, first set up Firefox remote debugging over USB or via Wi-Fi.

If prompted, allow the incoming connection on your Android device. Now start your extension on the Android device using web-ext run. You will need to have at least one tab opened in order for your extension to load. Click your device in the left-hand column and scroll down to find Processes in the list of active features in the browser.

For much of the debugging work, it's useful to be able to view Console with Inspector or Debugger. You do this using the split console, press esc to activate this mode.

In the Debugger you can set breakpoints, step through code, modify the extension's state, and do everything else you'd expect to be able to do in a debugger. Any messages logged by your code display in Console.

To inspect the popup's HTML and CSS, use Inspector. First, click the page select icon () to open the HTML document you want to inspect. You can review and modify the document's HTML and CSS in Inspector, as you would with any webpage.

In addition to the messages from your code, the console may also include messages about the validation of the extension's manifest.json files. These messages can be viewed using the adb logcat command. To avoid receiving other unrelated messages, you can pipe the output through grep, filtering by the extension's ID. For example:

Firefox for Android doesn't have full feature parity with the desktop version of Firefox. There are several known issues with Firefox for Android that can lead to a poor user experience. Therefore, it's recommended you use Manifest V2 for extensions targeting Firefox for Android.

OAuth 2.0 allows users to share specific data with an application while keeping their usernames, passwords, and other information private. For example, an application can use OAuth 2.0 to obtain permission fromusers to store files in their Google Drives.

Installed apps are distributed to individual devices, and it is assumed that these apps cannot keep secrets. They can access Google APIs while the user is present at the app or when the app is running in the background.

This authorization flow is similar to the one used for web server applications. The main difference is that installed apps must open the system browser and supply a local redirect URI to handle responses from Google's authorization server.

For mobile apps, you may prefer to use Google Sign-in for Android or iOS. The Google Sign-in client libraries handle authentication and user authorization, and they may be simpler to implement than the lower-level protocol described here.

For apps running on devices that do not support a system browser or that have limited input capabilities, such as TVs, game consoles, cameras, or printers, see OAuth 2.0 for TVs & Devices or Sign-In on TVs and Limited Input Devices.

Any application that uses OAuth 2.0 to access Google APIs must have authorization credentials that identify the application to Google's OAuth 2.0 server. The following steps explain how to create credentials for your project. Your applications can then use the credentials to access APIs that you have enabled for that project.

To complete the verification process, you can use your Google Play Developer Account if you have one and your app is registered on the Google Play Console. The following requirements must be met for a successful verification:

To receive the authorization code using this URL, your application must be listening on the local web server. That is possible on many, but not all, platforms. However, if your platform supports it, this is the recommended mechanism for obtaining the authorization code.

Scopes enable your application to only request access to the resources that it needs while also enabling users to control the amount of access that they grant to your application. Thus, there may be an inverse relationship between the number of scopes requested and the likelihood of obtaining user consent.

The following steps show how your application interacts with Google's OAuth 2.0 server to obtain a user's consent to perform an API request on the user's behalf. Your application must have that consent before it can execute a Google API request that requires user authorization.

Google supports the Proof Key for Code Exchange (PKCE) protocol to make the installed app flow more secure. A unique code verifier is created for every authorization request, and its transformed value, called "code_challenge", is sent to the authorization server to obtain the authorization code.

To obtain user authorization, send a request to Google's authorization server at This endpoint handles active session lookup, authenticates the user, and obtains user consent. The endpoint is only accessible over SSL, and it refuses HTTP (non-SSL) connections.

Determines how Google's authorization server sends a response to your app. There are several redirect options available to installed apps, and you will have set up your authorization credentials with a particular redirect method in mind.

The value must exactly match one of the authorized redirect URIs for the OAuth 2.0 client, which you configured in your client's API Console Credentials page. If this value doesn't match an authorized URI, you will get a redirect_uri_mismatch error.

Scopes enable your application to only request access to the resources that it needs while also enabling users to control the amount of access that they grant to your application. Thus, there is an inverse relationship between the number of scopes requested and the likelihood of obtaining user consent.

Specifies what method was used to encode a code_verifier that will be used during authorization code exchange. This parameter must be used with the code_challenge parameter described above. The value of the code_challenge_method defaults to plain if not present in the request that includes a code_challenge. The only supported values for this parameter are S256 or plain. state Recommended Specifies any string value that your application uses to maintain state between your authorization request and the authorization server's response. The server returns the exact value that you send as a name=value pair in the URL fragment identifier (#) of the redirect_uri after the user consents to or denies your application's access request.

You can use this parameter for several purposes, such as directing the user to the correct resource in your application, sending nonces, and mitigating cross-site request forgery. Since your redirect_uri can be guessed, using a state value can increase your assurance that an incoming connection is the result of an authentication request. If you generate a random string or encode the hash of a cookie or another value that captures the client's state, you can validate the response to additionally ensure that the request and response originated in the same browser, providing protection against attacks such as cross-site request forgery. See the OpenID Connect documentation for an example of how to create and confirm a state token.

If your application knows which user is trying to authenticate, it can use this parameter to provide a hint to the Google Authentication Server. The server uses the hint to simplify the login flow either by prefilling the email field in the sign-in form or by selecting the appropriate multi-login session.

The URLs are identical except for the value of the redirect_uri parameter. The URLs also contain the required response_type and client_id parameters as well as the optional state parameter. Each URL contains line breaks and spaces for readability.

In this step, the user decides whether to grant your application the requested access. At this stage, Google displays a consent window that shows the name of your application and the Google API services that it is requesting permission to access with the user's authorization credentials and a summary of the scopes of access to be granted. The user can then consent to grant access to one or more scopes requested by your application or refuse the request. 152ee80cbc

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