Per-Site User-Agent Switcher by Rubidium
Change and store User-Agent per domain on Firefox.
Extension Metadata
Screenshots
About this extension
Per-Site User-Agent Switcher allows you to override and remember your User-Agent string on a per-domain basis.
- Domain-Specific Memory: Set a custom User-Agent once, and it will be remembered every time you visit that domain.
- Quick Toggle: Switch between Desktop, Mobile, and Default browser modes with one click.
- Comprehensive Emulation: Modifies both HTTP network headers and JavaScript
navigator.userAgentfor full compatibility. - Multi-language Support: Supports English and Italian interface.
- Clean & Private: No tracking, no external servers, all data stays in local storage.
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Permissions and data
Required permissions:
- Block content on any page
- Access your data for all websites
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.2
- Size
- 79.53 KB
- Last updated
- a month ago (Oct 1, 2026)
- Related Categories
- License
- Mozilla Public License 2.0
- Version History
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