Two issues on macOS Firefox Nightly: memory usage and password manager

MegaWall — Fri, 16 Oct 2026 09:49:42 GMT

I'm reporting two problems on macOS Firefox Nightly.

Memory usage: The "Firefox Nightly GPU Helper" and "Firefox Nightly CP WebExtensions" processes consume significantly more memory than Safari or Chrome under similar workloads. I have very few extensions installed . Removing ABP did less help. Hardware acceleration on/off doesn't change the situation. Memory keeps growing over time.

Password manager: When my macOS user account has no login password set, the "Show", "Edit", and "Copy" buttons in Firefox's password manager (about:logins) do nothing. No error message or prompt appears. The workaround is to uncheck "Require device sign-in to fill and manage passwords" in settings. This seems like a bug where the code silently fails when system authentication is unavailable.

Environment:

macOS Sequoia 15.7.7, Apple M4 chip

Latest Firefox Nightly

Please investigate. Thank you.

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Two issues on macOS Firefox Nightly: memory usage and password manager