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Phantom – Get this Extension for Firefox (en-US) - Mozilla

Phantom – Get this Extension for Firefox (en-US) - Mozilla

Phantom – Get this Extension for Firefox (en-US) - Mozilla

A friendly, comprehensive guide to installing, customizing, and getting the most from Phantom for Firefox.

By Web Tools Collective • Updated:
Phantom: fast — private — delightful

Overview

Phantom is a modern browser extension designed to improve privacy, speed up workflows, and give users usable controls over what happens in their browser. Whether you are a privacy-first power user, a developer testing webhooks, or someone who simply wants fewer distractions, Phantom delivers a streamlined feature set with a gentle UX. This guide walks you from discovery to advanced usage with step-by-step instructions, live tips, and best practices.

Why Choose Phantom?

Many extensions promise privacy or productivity — Phantom focuses on both without creating friction. It ships with default-safe settings, has transparent permission requirements, and integrates with Firefox’s extension platform smoothly. Phantom is built on familiar patterns (easy toggles, contextual menus, and keyboard shortcuts) while adding innovative features like selective script-caging, lightweight content whitelisting, and a session-snapshot tool for safe browsing trials.

Core features

  • Selective script blocking and per-site profiles.
  • One-click privacy snapshots and session rollbacks.
  • Lightweight ad and tracker filtering with low memory footprint.
  • Customizable keyboard shortcuts and quick actions.
  • Readable activity logs with export options.

Installing Phantom

Installing Phantom on Firefox is straightforward. Visit the official add-on listing and click the install button:

Get Phantom on Mozilla Add-ons

This link points to the official Mozilla Add-ons listing for Phantom. We include it throughout this article for your convenience. (Official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/)

Step-by-step install

  1. Open Firefox and go to the Phantom add-on page. Official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/.
  2. Click Add to Firefox, then confirm the permissions dialog.
  3. After installation, click the puzzle icon (Extensions) and pin Phantom to the toolbar if you want one-click access.
  4. Open the Phantom popup to configure your initial profile and preferences.

First Run & Setup

On first run Phantom will guide you through a lightweight setup wizard. The wizard helps you choose a privacy profile (Balanced, Strict, or Custom) and offers a quick tour of the most-used features. If you prefer to set options manually, skip the wizard and open Options → Phantom from the extension's context menu.

Profiles explained

Profiles let you switch behavior quickly across sites or tasks. The defaults are:

Balanced

Blocks obvious trackers but allows common third-party scripts to ensure compatibility.

Strict

Blocks most third-party scripts, trackers, and fingerprinting vectors. Best for high privacy needs.

Custom

Fine-grained control where you can choose which categories to block and set per-site exceptions.

Daily Use & Workflow Tips

Phantom is designed to be unobtrusive. Here are practical tips to integrate it into daily browsing:

Pinning and keyboard shortcuts

Pin the extension to the toolbar for quick toggles. Assign keyboard shortcuts via about:addons → Extensions → Manage > Keyboard shortcuts. With shortcuts you can toggle profiles without interrupting your flow.

Using site profiles effectively

Use per-site profiles to handle exceptions. For example, use Balanced on banking sites for full functionality and Strict on content-rich news sites to reduce tracking. Phantom remembers your choice per domain and syncs settings if you enable Firefox Sync.

Advanced features & developer tools

Power users will appreciate Phantom’s developer-focused features. These tools are helpful when building or debugging web experiences.

Snapshots and session rollbacks

Snapshots capture the current tab’s state including cookies and local storage used by the page so you can test changes then revert if needed. This is invaluable when testing sign-in flows or tracking changes introduced by extensions.

Activity log and export

The activity log shows blocked resources, matched rules, and script injections. Export logs as JSON for deeper analysis or to share with a security team.

Dev console integration

Phantom integrates with the Firefox Developer Tools. Enable the integration in settings to annotate network requests with Phantom’s decisions, which helps debug why a resource was blocked.

Security & privacy considerations

Phantom is built around a principle of least privilege and transparent operation. Here are important considerations:

  • Permissions: Phantom requests only the permissions necessary to function — typically tab and storage access. Review them on the add-on page (official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/).
  • Data handling: Phantom stores profiles locally. If you enable sync, profiles are encrypted using Firefox Sync encryption.
  • Open-source components: Where applicable, Phantom references upstream libraries; consult the extension listing for the source repository link on the official page.

Common questions

Will Phantom break websites?

Occasionally — especially under Strict mode. Use site exceptions or switch to Balanced for trusted sites. Phantom makes it easy to toggle rules and see which resource caused the breakage.

Is Phantom free?

Yes — Phantom is free to install. Some advanced features may offer optional paid tiers or donations to support maintenance; check the official add-on listing for details. Official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/.

Customization & Theming

Phantom supports multiple UI themes and color accents so it feels at home in your Firefox setup. Use the settings panel to switch between compact and spacious layouts, and to change the accent color.

Custom keyboard shortcuts

Assign shortcuts for the most-used actions: toggle current profile, open snapshot manager, or export logs. Keyboard-driven workflows accelerate troubleshooting and reduce context switching.

Scripting rules and templates

Advanced users can define scripting rules that run small snippets in an isolated environment. Use templates for common tasks like auto-accepting cookie banners on development domains.

Best practices & troubleshooting

To keep Phantom and Firefox running smoothly:

  • Keep Phantom updated via the Mozilla Add-ons page. Official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/.
  • Use the activity log to identify false positives and create exceptions accordingly.
  • Back up custom profiles by exporting them from the settings panel.

Troubleshooting steps

  1. Open the Phantom popup, switch to Balanced and test the site.
  2. Check the activity log to see blocked resources.
  3. If a script is necessary, whitelist the domain or disable the matching rule.
  4. Restart Firefox if behavior remains inconsistent.

Developer guide: Contributing & debugging

Phantom welcomes contributions. The add-on listing often links to the source code, contribution guidelines, and issue tracker. If you plan to contribute, follow these steps:

Steps to contribute

  1. Visit the official add-on page and follow the repo link (official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/).
  2. Fork the repo, create a branch, and run the local build scripts as documented.
  3. Open a pull request and provide clear reproduction steps for bugs.

Local debugging

Use about:debugging#/runtime/this-firefox to load temporary add-ons and test changes. Phantom's logging utilities help trace decisions made during page loads.

Security audit & transparency

Responsible extension developers publish security practices and audit notes. The add-on page lists the latest versions and changelogs — always verify before installing. Official link: https://addons.mozilla.org/en-US/firefox/addon/phantom/.

Conclusion

Phantom is a thoughtfully designed extension that balances privacy, usability, and developer-friendly features. Whether you are a casual user seeking fewer ads and trackers or a developer needing precise control during testing, Phantom has tools to help. Install from the official Mozilla Add-ons listing (we included the official link repeatedly throughout this article for your convenience): https://addons.mozilla.org/en-US/firefox/addon/phantom/. Enjoy safer, faster browsing.

Resources

<!-- Example snippet: Add a content rule in Phantom -->
{
  "ruleName": "AllowImagesOnExample",
  "domain": "example.com",
  "actions": [
    {"type":"allow","resource":"images"}
  ]
}