# Sync Theme

> Automatically switches Gmail, Grafana, and Slack between light and dark to match your operating system's theme. Works only on those sites — no accounts, no tracking, no data collection. Allows custom domains for self-hosted Grafana.

Canonical page: [https://chrome-stats.com/d/sync-theme](https://chrome-stats.com/d/sync-theme)

## Overview

- **ID:** `sync-theme`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Dee
- **Category:** appearance
- **Version:** 1.0.0
- **Last updated:** 2026-06-30
- **First published:** 2026-06-27
- **Size:** 52 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/sync-theme/)
- **Website:** [https://github.com/sideprojects-dee/sync-theme](https://github.com/sideprojects-dee/sync-theme)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/sync-theme/privacy/](https://addons.mozilla.org/firefox/addon/sync-theme/privacy/)

## Description

Sync Theme keeps Gmail, Grafana, and Slack in step with your operating system's light/dark setting. Flip your OS to dark mode and your open Gmail, Grafana, and Slack tabs follow automatically — and back to light when you switch back.

Features
• Works on Gmail, Grafana (Grafana Cloud and self-hosted), and Slack web.
• A master on/off switch plus a per-site toggle, so you can run just the sites you want.
• Add self-hosted Grafana instances on your own domains — you approve each one through Firefox's permission prompt.
• No accounts, no tracking, no data collection, no remote servers.

How it works
When your OS theme changes, Sync Theme switches each site using that site's own built-in light/dark control, so it looks exactly as the site intends — including custom Slack workspace themes. It runs only on Gmail, Grafana, and Slack, never on other sites, unless you explicitly add a self-hosted Grafana domain on the options page.

Privacy
Sync Theme does not collect, transmit, or sell any data. Your on/off preferences sync through your own Firefox account; any self-hosted domains you add stay on your device. Full policy: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/5f7a79d676b700a9d484fbe85472e0d90d38d60bf21d6b5458f2e320ef3023a0/https%3A//github.com/sideprojects-dee/sync-theme/blob/main/PRIVACY.md" rel="nofollow">https://github.com/sideprojects-dee/sync-theme/blob/main/PRIVACY.md</a>

## Rankings

- #135,172 — Overall

## Permissions and access

### Permissions

- `storage`
- `scripting`

### Content script matches

- `*.grafana.com`
- `*.grafana.net`
- `*.slack.com`
- `grafana.com`
- `mail.google.com`
- `slack.com`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Request access to the following domains: grafana.com, grafana.net, slack.com, google.com
- 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).

## Similar extensions and apps

- [Gmail Theme Sync](https://chrome-stats.com/d/gmail-theme-sync) — 2 users
- [Dark mode for Slack](https://chrome-stats.com/d/dark-mode-for-slack) — 1 users, 5.00 / 5
- [Dark theme for Slack](https://chrome-stats.com/d/dark_theme_for_slack) — 33 users, 3.75 / 5
- [Slack Chrome UA Spoofer](https://chrome-stats.com/d/slack-chrome-ua-spoofer)
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Source: [Chrome-Stats](https://chrome-stats.com/d/sync-theme)