Extensions

Because Omni runs the real Gecko engine, it supports genuine Firefox WebExtensions — the same .xpi add-ons you install on desktop Firefox.

Why this matters

Most “extension-capable” Android browsers have no extension support or a tiny curated store. Omni inherits GeckoView’s full WebExtension runtime:

Install add-ons directly from addons.mozilla.org.
Run Manifest V2 extensions with background scripts, content scripts and the standard browser.* APIs.
Use extensions in private browsing (per-extension opt-in).

The extension surface

📦Bundled extensions →The three add-ons that ship inside the APK. ⬇️Installing add-ons →Step-by-step from addons.mozilla.org.

How they’re managed

Extension lifecycle lives in browser/extensions/. BuiltInExtensionManager installs the bundled set; runtime registration happens on the shared GeckoRuntime, so extensions persist across tabs and sessions.

Limitations

Manifest V3 support follows GeckoView’s evolving implementation; MV2 is fully supported.
Extensions needing desktop-only APIs may degrade gracefully.
No auto-update store UI — bundled extensions update with app releases.

Extensions run with real permissions

A WebExtension can read and modify every page you visit. Only install add-ons you trust, and prefer well-known ones from AMO.