Firemonkey
FireMonkey combines user-script and user-style management in a browser extension, with help and changelog resources provided by the project.
About Firemonkey
FireMonkey manages user scripts and user styles in one tool. It stores scripts and CSS in client-side storage, injects them into websites, and can export scripts, CSS and preferences. It shows running scripts for the active tab and supports copying data to the clipboard.
The project lists Firefox and Firefox for Android support with minimum versions that vary by release, and describes version 4 as future Manifest V3 work. The code is available under the MPL-2.0 license.
Key features
- Manage user scripts and user styles together
- Inject scripts and CSS into websites
- Store scripts and CSS in client-side storage
- Export scripts, CSS and preferences
- Show running scripts for active tab
- Copy data to clipboard
Best for: Firefox users who want combined management of user scripts and user styles.
Good for
- Combines script and style management in one project
- Open source under MPL-2.0 license
- Provides help, changelog and script and style API comparisons
Watch out for
- Requires minimum Firefox versions that vary by release
- Beta installation requires manual download and temporary loading
- Requests broad permissions including data access for all websites
Firemonkey at a glance
- Category
- Software & Utilities › Browser Extensions
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Android
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Firemonkey FAQ
What permissions does FireMonkey use?
Clipboard input to copy, downloads to export scripts, CSS and preferences, notifications to inform users, tabs for tab operations, client-side storage to store scripts and CSS, navigation activity to show running scripts, and access to all websites to inject scripts and CSS.
How is the beta version installed?
Back up settings, download the repository ZIP, unzip it, then load manifest.json as a temporary add-on through about:debugging, with additional signature and file steps on Android.
What license covers the project?
MPL-2.0 license.
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