Initial commit: Add Firefox userChrome.css customization and document…

…ation

- Add userChrome.css for Firefox UI customization
- Create Readme.md with setup instructions

Readme.md

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+# Zen Browser - No Margin Mod
+
+## Description
+A custom CSS modification for Zen Browser that removes default margins from various UI elements, creating a cleaner and more space-efficient interface.
+
+## Features
+- Removes default margins from the zen-tabbox-wrapper container
+- Eliminates margins from the browser sidebar container
+- Creates a more streamlined visual experience
+
+## Installation
+1. Navigate to your Zen Browser profile directory
+2. Locate or create the `chrome` folder
+3. Place the `userChrome.css` file inside the chrome folder
+4. Restart Zen Browser
+
+## Code Overview
+The modification consists of two main CSS rules:
+- `#zen-tabbox-wrapper`: Removes all margins
+- `.browserSidebarContainer`: Removes right, left, and bottom margins
+
+## Compatibility
+- Tested with latest versions of Zen Browser
+- Should work with most modern Zen Browser releases
+
+## Contributing
+Feel free to submit issues and enhancement requests.
+
+## License
+This project is licensed under the MIT License - see the LICENSE file for details.
+
+## Support
+
+For support, please contact:
+
+- Email: [[email protected]](mailto:[email protected])
+- Telegram: [@SG991](https://t.me/SG991)
+- Discord: [Sterbweise](https://discord.com/users/sterbweise/)
+
+You can also open an issue on this repository for bug reports or feature requests.
+
+---
+
+Developed with ❤️ by [Sterbweise](https://github.com/Sterbweise)

userChrome.css

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+/* Remove default margins from the zen-tabbox-wrapper container */
+#zen-tabbox-wrapper {
+    margin: 0 !important; /* Simplified from '0px' to '0' as 'px' is not needed for zero values */
+}
+
+/* Remove margins from the browser sidebar container for a cleaner layout */
+.browserSidebarContainer {
+    /* Using shorthand margin property would be cleaner here, but keeping separate properties 
+       for better compatibility with existing code */
+    margin-right: 0 !important;
+    margin-left: 0 !important;
+    margin-bottom: 0 !important;
+}