This extension allows you to toggle userchrome.css styles on-the-fly with buttons and hotkeys. You'll be able to switch up to six styles

Userchrome Toggle Extended - Firefox Add-on
"Userchrome Toggle Extended" is a Firefox add-on that enables users to dynamically toggle userchrome.css styles with convenient buttons and hotkeys. With support for up to six styles, this extension enhances your browsing experience by allowing quick customization of Firefox's look and feel. Perfect for users who want to personalize their interface without complex setups.
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Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
User reviews
The addon is superior to the original userchrome toggle but on macos there's a bug, when you open a new window it doesn't recognize the original style (not toggled) until you switch to another window or app and come back. Really kind of defeats the purpose.
Edit: The second invisible character \u200b seemed to be the issue. \u200f works as intended for me.
by Firefox user 18430579, 2025-02-10
by Tanvir, 2024-11-30
Fix issue of the old extension. The shorkey failed to toggle the state.
by Fred, 2024-10-13
Add-on safety
Risk impact
Userchrome Toggle Extended does not require any sensitive permissions.
Risk impact analysis details
- Low Request access to the following domains:
Risk likelihood
Userchrome Toggle Extended is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
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