Password manager browser extensions — what to look for

For most users, the browser extension is the password manager. It is the interface they interact with dozens of times a day — detecting login forms, filling credentials, saving new passwords, and generating new ones. The underlying encryption architecture may be the most important security property, but the extension quality determines whether the tool actually gets used.

Extension quality has concrete dimensions: autofill detection on standard and non-standard login forms, how the extension behaves on single-page applications, performance impact on browser load times, and what happens when autofill fails and the user needs to find the credential manually.

Quick answer

You want the most reliable autofill on standard sites

Dashlane — consistently rated most reliable autofill in independent reviews

You want open-source extension code you can verify

Bitwarden — extension published on GitHub; functionality audited by Cure53

You want autofill plus built-in TOTP and email aliases

Proton Pass — TOTP generation and SimpleLogin alias creation directly from the extension

When it matters

Standard form autofill — all providers handle conventional username/password forms reliably. The differences appear on non-standard implementations
Single-page application (SPA) autofill — modern web apps built with React, Vue, or Angular often use custom form components that basic extensions miss. Dashlane handles these most consistently
In-page overlay vs. icon autofill — some extensions show an inline overlay; others show a field icon. Both work; the overlay approach is faster for users who prefer not to click the icon
TOTP integration — Bitwarden (Premium) and Proton Pass generate TOTP codes directly in the autofill flow; other managers require switching to a separate authenticator app
Password generator accessibility — one click from any password field to generate a new credential; all providers support this; generator customisation options vary

When it fails

Extension conflicts — running two password manager extensions simultaneously causes autofill conflicts; commit to one primary extension
SPA autofill failures — Bitwarden's most common complaint is silent autofill failure on non-standard login forms; no warning, user must copy-paste manually
Extension auto-lock vs. OS lock — most extensions lock independently from the OS lock state; an unlocked browser on a locked computer may leave the vault extension accessible

How providers fit

Dashlane — autofill reliability on complex and non-standard forms is the product's most consistently cited strength. The extension discontinued the native desktop app in 2022; the extension is the primary desktop interface.

Bitwarden — extension is open-source and available for Chrome, Firefox, Safari, Edge, Brave, and Opera. TOTP generation on Premium. Autofill occasionally fails silently on SPA forms — the most significant user-reported friction point.

Proton Pass — extension integrates TOTP generation and SimpleLogin alias creation directly into the autofill flow. As a newer product, edge cases in autofill detection are more frequent than established alternatives.

Bottom line

Dashlane for the most reliable autofill across site types. Bitwarden for open-source extension code and broad browser coverage. Proton Pass for integrated TOTP and email alias generation alongside autofill.

Password manager vs. browser-saved passwords TOTP in vault vs. dedicated authenticator Password managers for non-technical users