# Anti-Flashbang

> Dark curtain on page load kills white flash. Per-site exclusions — no broken pages, no per-element inversion.

Canonical page: [https://chrome-stats.com/d/anti-flashbang](https://chrome-stats.com/d/anti-flashbang)

## Overview

- **ID:** `anti-flashbang`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** FrostyByte
- **Category:** appearance
- **Daily users:** 1
- **Weekly downloads:** 1
- **Rating:** 4.00 / 5 (1 ratings)
- **Version:** 1.2.1
- **Last updated:** 2026-05-22
- **First published:** 2026-05-11
- **Size:** 17 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/anti-flashbang/)

## Description

Anti-Flashbang paints a dark background at the very first moment of page
load, preventing the white flash between navigations.

Unlike Dark Reader, it never touches individual elements. The curtain is a
single CSS rule at user-stylesheet origin - no !important. When the page's
own stylesheet loads, it naturally overrides the curtain via cascade
ordering. No removal logic, no DOM mutation, no broken pages.

v1.2: Per-site exclusions
Sites where the dark background leaks through can be disabled from the
popup. Uncheck "Enable on this site" - the curtain is never injected on that
domain or any of its subdomains. Excluding <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/18292d9c1899dd2b453ea9e3c1375587569f07a1d91694af6d865f8eab086cdb/http%3A//github.com" rel="nofollow">github.com</a> covers
<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/cf3cd4f3fb18a45c1c2f63897e791d11eb79f9bdf934f54389d73b2908caa57d/http%3A//gist.github.com" rel="nofollow">gist.github.com</a>, <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/9d93dd947e8036d42329052d64108de53526684eb373353910ff66ff9a459912/http%3A//docs.github.com" rel="nofollow">docs.github.com</a>, and so on. Already-open tabs pick up
exclusions immediately without reloading.

Toggle on/off from the toolbar icon. No network calls. No telemetry.
No remote code. Just cascade physics.

## Rankings

- #86,289 — Overall
- #110 — flash
- #111 — adobe flash
- #154 — flashcards

## Permissions and access

### Permissions

- `storage`
- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/anti-flashbang)