Frequently asked questions
Is OpenImmersive free?
Yes. The extension is free and open-source (AGPL-3.0). Built-in engines like Google and MyMemory need no payment or key. Premium engines (DeepL/DeepSeek/OpenAI) are optional and use your own account.
Does it collect my data or send my browsing to your servers?
No. OpenImmersive has no backend. Translation requests go directly from your browser to the engine you chose. We collect nothing and run no telemetry.
Do I need an account?
No account, no sign-up. Install and use.
Where are my API keys stored? Are they safe?
Keys are stored locally in your browser only and are never uploaded. Requests to premium engines go straight from your browser using your key.
Which browsers are supported?
Firefox today (WebExtension, Manifest V2). Other browsers may come later.
Which translation engines can I use?
Free: Google, MyMemory, LibreTranslate (self-hostable). Bring-your-own-key: DeepL, DeepSeek, OpenAI.
Can it translate PDFs?
Yes. PDFs are translated into real, selectable text while keeping images, tables and layout. Choose bilingual or translation-only output. Scanned image-only PDFs aren't supported yet.
How do I turn translation on or off?
Press Alt+T, or use the toolbar popup.
Is it really open source?
Yes — licensed under AGPL-3.0, source on GitHub, pure JS with no build step so it's easy to audit. AGPL also means any modified version, even one run as a hosted service, must keep its source open.
How do I install it?
See the install guide (Firefox temporary load for dev, or packaged .xpi).