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Messenger Tabs

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Overview Add-ins Activities Tabs Manifest Submission Security

Service pages inside Messenger

Tabs are planned as reviewed web or packaged panels that live beside the contact list. They are useful for Mocha services, community tools, partner pages, and other lightweight experiences.

Good tab ideas

Idea	Example
Mocha service	Home, Forums, Service Status, Downloads, Webmail, or Member Services.
Community	Events, radio, fan pages, public rooms, or help resources.
Partner service	A reviewed music, game, profile, or creator page.
Packaged tool	A small HTML utility bundled inside the add-in package.

Manifest preview

{ "type": "tabPage", "label": "Mocha Forums", "icon": "https://forums.mochachat.net/favicon.ico", "tab": { "source": "https", "url": "https://forums.mochachat.net/", "placement": "mainWindow", "defaultVisible": false, "requiresSignIn": false, "width": 320, "height": 480, "declaredOrigins": ["https://forums.mochachat.net"], "bridgeApi": "none", "allowPopups": false } }

Permission requirements

ui.tabs lets the add-in appear as a Messenger tab.
webview.hostedContent lets the tab render declared HTTPS or packaged HTML content.
webview.mochaBridge is only for reviewed tabs that need a narrow JavaScript bridge to Messenger.
icon is required for every tabPage entry; tabs without a usable icon are incomplete.

Tabs do not receive private messages, contact lists, Passport tokens, saved credentials, or arbitrary file access. Any bridge features must be declared, reviewed, and shown to the user before the tab is enabled.