Good question — worth clarifying the distinction.

All extensions hosted on AMO (addons.mozilla.org) go through Mozilla’s review process, including NightOwl. The review checks for malicious code, policy violations, and security issues before an extension goes public.

What NightOwl doesn’t have is Mozilla’s ‘Recommended’ badge. The Recommended badge means Mozilla’s team has done an additional in-depth review beyond the standard process. Dark Reader has been around since 2014 and has millions of users, so it’s well-established for that badge.

NightOwl is a newer, smaller extension and hasn’t been through the extended Recommended review yet.

On privacy specifically: both extensions run locally and don’t phone home. NightOwl’s privacy argument is simpler code = smaller attack surface, not that it’s undergone more scrutiny. If you want the more established, thoroughly audited option, Dark Reader is that.

So the honest answer: Dark Reader is the safer established choice. NightOwl is for people who want a simpler lightweight alternative with the same local-only approach.

Nothing wrong with it — Dark Reader is genuinely great. NightOwl is a lighter alternative using CSS inversion rather than Dark Reader’s more complex rendering approach.

The main practical difference is simplicity: NightOwl applies a filter, Dark Reader does more sophisticated per-page processing. For most users Dark Reader is the better choice; NightOwl is for people who prefer minimal extensions or specifically like the CSS inversion behavior.

Honest answer: depends what you need.

Dark Reader is the more established extension with more features — it does color temperature adjustments, custom backgrounds, brightness control per site. NightOwl uses a simpler CSS inversion approach.

The tradeoff: Dark Reader’s extra processing can occasionally cause layout issues on complex pages, while NightOwl is more predictable since it just applies an invert filter.

If you’re already using Dark Reader and it works for you, there’s not a compelling reason to switch. NightOwl is more for people who want a lighter alternative or specifically want CSS inversion behavior. Both do the same core job.

Thanks for flagging that — you’re right, the formatting on the AMO listing page needs work. I’ll get that cleaned up. AMO’s description editor is finicky with some markdown elements. Appreciate the heads up!

Good question! Firefox’s built-in session restore is automatic — it opens your last session when Firefox starts or after a crash. But it’s not controllable: you can’t name sessions, you can’t save “this set of tabs as a project I’ll need later”, and it doesn’t persist through a deliberate close.

This extension is for the manual use case: you want to save a named snapshot (“Research for client X”, “Weekend reading”, “Work context”) that stays saved indefinitely, and restore it in one click when you need it — separate from whatever Firefox’s auto-restore is doing.

So yes, Firefox handles crash/restart recovery automatically. This is for explicit, named, persistent workspaces.