Browser add-on · Firefox

Bitwarden for Firefox

Bitwarden's Firefox add-on is feature-equivalent to the Chrome extension — autofill, password generation, vault access — but uses Firefox's native WebExtensions API rather than Chromium's.

Install from Mozilla Add-ons

Official add-on. Reviewed by Mozilla. Same Bitwarden code as the Chrome extension, packaged for Firefox's WebExtensions runtime.

Open Mozilla Add-ons → ~5 MB · Recommended by Mozilla

Installation steps

Click Open Mozilla Add-ons above. Firefox opens addons.mozilla.org page.
Click Add to Firefox. Permissions dialog appears — confirm.
Bitwarden icon appears in the toolbar. Click it → log in or create account.
Pin the icon if you don't see it: right-click toolbar → Customize → drag Bitwarden into the toolbar.

Firefox vs Chrome — any difference?

Functionally identical. Firefox uses the WebExtensions API which is mostly compatible with Chrome's manifest, but a few small behaviours differ:

Multi-account containers: Firefox-only feature. Bitwarden can be configured per-container — useful if you want different vaults for work vs personal browsing.
Container-aware autofill: Bitwarden treats different containers as different browser profiles for unlock purposes.
Permissions UI: Firefox shows permissions slightly differently from Chrome at install time.
Sandbox model: Firefox's add-on sandbox is stricter — some hardware key (FIDO2) flows might require an extra permission grant.

Firefox forks (LibreWolf, Waterfox, Tor Browser)

LibreWolf: works directly. addons.mozilla.org install path is enabled by default.
Waterfox: works directly.
Tor Browser: add-ons disabled by default for fingerprinting reasons. Bitwarden technically installs but actively reduces Tor's anonymity properties — not recommended.
Mullvad Browser: same Tor concern — Mullvad ships with no add-ons by design.

Biometric unlock

Same browser-integration setup as Chrome — install the Bitwarden desktop app, enable browser integration in app settings, then enable biometric unlock in the Firefox add-on settings. Touch ID / Windows Hello / fingerprint becomes the unlock prompt.

Bitwarden in Firefox for Android

Firefox for Android supports a small curated list of WebExtensions. Bitwarden is on the list:

Open Firefox on Android → menu → Add-ons.
Find Bitwarden, install.
Use it via the Firefox toolbar same way as desktop.

Most people prefer the native Bitwarden Android app for autofill across all apps (not just Firefox), but the add-on is useful if you only want password help inside Firefox specifically.

Firefox add-on — frequently asked questions

Is Bitwarden a Mozilla Recommended add-on?

Yes — Mozilla's "Recommended" badge means the add-on is reviewed for security and quality by Mozilla's team. Few password managers carry it. The badge is visible on the addons.mozilla.org listing.

Does it work with Firefox containers?

Yes — Bitwarden runs in each container the same way it does in normal browsing. You can set up per-container vault access if needed via the Multi-Account Containers extension; rare use case but possible.

Can I install Bitwarden on Firefox ESR?

Yes — Firefox ESR (Extended Support Release) supports the same WebExtensions API as Firefox. Some enterprise deployments standardise on ESR; Bitwarden works without modification.

Why does Firefox autofill not work on some sites?

Firefox's built-in password manager and Bitwarden can both try to fill — they sometimes interfere. Recommended: disable Firefox's built-in (Settings → Privacy & Security → Logins and Passwords → uncheck "Ask to save logins"). Then Bitwarden has the field unambiguously.

Is the source code published?

Yes — at github.com/bitwarden/clients/tree/main/apps/browser. Same codebase produces both Chrome and Firefox builds.