Betterfox provides Firefox about:config preference tweaks and user.js settings intended to adjust privacy, security, and performance.
Open source
19 alternativesFirefox Scripts
Firefox Scripts provides userChromeJS, autoconfig.js, and extension scripts, with installation instructions for Firefox Developer Edition.
About Firefox Scripts
Firefox Scripts is a GitHub repository of userChromeJS scripts, autoconfig.js files, and extensions for customizing Firefox. The README gives manual installation steps: extract a downloaded zip into the Firefox installation folder, create a chrome folder in the profile, and save the chosen scripts into it. The instructions were tested on Firefox Developer Edition 131.0b4. The repository lists Linux and macOS as its platforms.
The scripts add browser behavior such as media control across tabs and changes to address bar autofill. One optional script, rebuild_userChrome.uc.js, adds a button for managing scripts, including enabling and disabling them without restarting Firefox. Not all scripts are restartless. Those marked with @shutdown require a restart, and the author notes that most scripts from other sources are not restartless. Some scripts are also compatible with Thunderbird, as marked in the README.
Key features
- Optional rebuild_userChrome.uc.js script for enabling and disabling scripts from a button
- BeQuiet script that controls media playback in other tabs with Ctrl+Alt+S, D, and A
- BeQuiet pauses other audio tabs when a new tab starts playing, resuming them later
- BeQuiet supports play and pause for Deezer, Spotify, and YouTube
- Address bar script that preselects the first autocomplete suggestion
- Download bundles for scripts only, extensions only, or both
- Installation instructions for Linux and macOS folder paths
Best for: Firefox users on Linux or macOS who are comfortable installing userChromeJS scripts manually and want to customize browser behavior.
Good for
- Open source, with the code hosted publicly on GitHub
- Includes an optional script for enabling and disabling scripts without restarting Firefox, for scripts that are restartless
- Includes installation instructions and a video walkthrough of the steps
Watch out for
- Not all scripts are restartless; scripts marked @shutdown require a restart
- Installation is manual and involves copying files into the Firefox installation and profile folders
- Instructions were tested on Firefox Developer Edition 131.0b4 only
Firefox Scripts at a glance
- Category
- Software & Utilities › Firefox Extensions
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, macOS
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Firefox Scripts FAQ
Can scripts be turned on and off without restarting Firefox?
The README describes rebuild_userChrome.uc.js as a button for managing scripts, including enabling and disabling them without restarting Firefox or Thunderbird. This does not apply to scripts that are not restartless, which have @shutdown at the start of their code.
Do the scripts work with Thunderbird?
Some scripts are marked in the README as also compatible with Thunderbird. Others are not marked.
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