For bugs in Firefox Desktop, the Mozilla Foundation's web browser. For Firefox user interface issues in menus, bookmarks, location bar, and preferences. Many Firefox bugs will either be filed here or in the Core product. Bugs for developer tools (F12) should be filed in the DevTools product. (more info)

Select a component to see open bugs in that component:


Issues with the Firefox Lockwise 'Logins and Passwords' management page. Issues with filling and saving passwords on websites belong in Toolkit::Password Manager.

Activity Streams: General

General Activity Streams bugs

Activity Streams: Server Operations

Bugs for server infrastructure supporting our application servers for activity streams

Activity Streams: Timeline

Bugs for the Timeline page activity streams implementation

Address Bar

For bugs in the Firefox "Smart Location Bar" (aka Awesome Bar) UI element, including the bookmark and history autocomplete matching behavior.

Bookmarks & History

Bugs and feature requests for Firefox bookmarks & history. This includes the bookmarks menu, add and modify bookmarks dialogs and the bookmarks manager.

Disability Access

Accessibility-related bugs in Firefox: screen readers, support for magnifier tools, user interface bugs affecting the experience of people with disabilities, compliance with national and international accessibility standards.


Bugs related to the creation of desktop distributions (distribution.ini)

Downloads Panel

For issues with the Downloads Panel, the new download manager of Firefox that lives in the navigation toolbar.

Enterprise Policies

Bugs and feature requests related to specific policies implemented in Firefox, or to the policy engine itself. Bugs about Group Policy Object (GPO) should be reported in this component.

Extension Compatibility

Version level or extension problems or Gecko problems that cause extensions not to work. Also home to INVALID bugs where a malfunctioning extension has broken Firefox.

File Handling

For issues dealing with helper applications, and guessing Content Types when they aren't specified/known (ftp:, file:, jar:, but generally not http:). This component does not cover: backend networking issues, such as those covered by Networking: FTP or Networking: File, nor does it cover the Download Manager which has its own component in the Toolkit product.

Firefox Accounts

For bugs in shared services/fxaccounts code related to Firefox accounts

Firefox Monitor

Bugs related to the Firefox Monitor (a.k.a Breach Alerts) feature within the Firefox UI. For issues with the website, please file an issue on GitHub.

Firefox View

Bugs relating to the Firefox View page, toolbar button and integration


Bugs found through the foxfooding program will be filed in this component to be later triaged to the appropriate buckets.


For bugs in Firefox which do not fit into other more specific Firefox components


For bugs related to headless browsing mode where Firefox is a web browser without a Graphical User Interface (GUI).


Bugs and feature requests for the Firefox application install wizard.

Launcher Process

Bugs relating to the Launcher Process for Windows builds

Messaging System

For bugs that involve user interrupting messages, badging and notifications in Firefox. This includes Contextual Feature Recommender (CFR), Onboarding Tour, Feature Callouts, Menu/Toolbar badges and door-hangers.


Firefox Profile Migration from other browsers.

New Tab Page

The page displayed when a new tab is opened (about:newtab).

Nimbus Desktop Client

All bugs related to Nimbus experimentation client code in Firefox Desktop

Normandy Client

In-browser component that validates and executes actions in a sandbox

Normandy Server

Web service to store and serve recipes

Page Info Window

For issues with the Page Info window.

PDF Viewer

For bugs related to Firefox's built-in PDF viewing capabilities (also known as pdf.js).


Pioneer is a data donation and sharing platform.


Bugs involving the integration with Pocket and Firefox.

Private Browsing

For bugs and feature requests in Firefox's Private Browsing implementation.

Protections UI

For bugs and feature requests in Firefox’s Anti-Tracking Protections UI such as the Protection Panel and the Protection Report.

Remote Settings Client

Module in charge of fetching and keeping remote settings in sync with Mozilla servers.


Bugs and feature requests for Firefox Screenshots


For app-level security bugs.

If the problem relates to underlying components (PSM, NSS, Core, Toolkit) then please file it in the appropriate product instead of here.

Session Restore

For bugs in Firefox's session restore functionality, including the undo close tab feature.

Settings UI

Bugs and feature requests for Firefox Settings. This is specific to the Tools->Settings UI - for issues with other types of settings (e.g. permissions, settings internal to websites, OS settings, ...), requests to change default settings values, bugs where internal values of settings have no effect, etc., file bugs in components related to those features/settings instead.

Shell Integration

This component is responsible for determining if Firefox is the default browser, setting Firefox as the default browser, and setting the desktop background.


Bugs and feature requests for Firefox Shopping

Site Identity

For bugs and feature requests in the UI that signals site identity and connection security, such as the lock icon and the corresponding “identity panel”.

Site Permissions

Bugs and feature requests for the Firefox UI to give or revoke web page permissions to access device functionality such as camera, microphone, geolocation or notifications.


Bugs and feature requests for Sync in Firefox Desktop.

System Add-ons: Off-train Deployment

Requests to ship a system add-on off-train through Go Faster (Balrog) (more info).

Tabbed Browser

For problems in the browser tab features or problems with the widget itself.


General user interface, user experience, and visual design for the default theme used in Firefox.

Toolbars and Customization

Bugs and feature requests for Firefox toolbars. This includes toolbar customization.

Top Sites

Bugs related to top sites on the new tab page and in the address bar


UITour, firstrun and whatsnew Firefox bugs.


Instant translation and language detection in Firefox.


For newly filed bugs that need some help finding the right place to go.

WebPayments UI

User Interface for the WebPayments Payment Request API and Payment Handler API.