How to Enable Xul Extensions in Waterfox - Waterfox

Open the Waterfox menu (hamburger icon) and navigate to Add-ons, then select Extensions to enable XUL extensions in Waterfox version 6.6.9 and later. This Firefox-based browser maintains legacy extension compatibility through its built-in XUL support, distinguishing it from modern Firefox releases that abandoned XUL architecture.

Accessing the Extension Manager

Launch Waterfox and click the three horizontal lines (menu button) in the top-right corner. Select "Add-ons" from the dropdown menu. The Extensions tab opens automatically, displaying currently installed addons. XUL extensions appear listed alongside standard WebExtensions.

Each addon shows an on/off toggle switch. Enable any disabled XUL extension by clicking its toggle to activate it.

XUL Support in Waterfox

Waterfox 6.6.9 preserves XUL functionality that Firefox eliminated in version 57. This means legacy extensions—those built using the older XUL and XPCOM frameworks—run natively without modification. Users preferring addon management through older protocols benefit significantly. The browser handles extension compatibility differently than current Firefox versions, allowing nostalgic users and developers to maintain established addon ecosystems without conversion to WebExtension standards.

Verifying XUL Extension Status

Once enabled, XUL extensions may require a browser restart to function properly. Check the Extensions list to confirm the addon shows as "Enabled." Green indicators or activation states vary by extension design. Some legacy addons display additional preferences accessible through the addon details panel. Users can manage permissions, access changelogs, and view compatibility notes directly from the extensions interface.

Waterfox serves users unwilling to abandon their XUL extension collections. The platform optimizes Windows performance while maintaining backward compatibility. For anyone requiring legacy addon support, Waterfox 6.6.9 remains a practical alternative to current Firefox releases.