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User-Agent Switcher and Manager vs ModHeader: catalog facts
User-Agent Switcher and Manager	ModHeader
Free Free to install.	Free Free browser extension with no sign-up.
Browser extension	Browser extension
Changes both request headers and JavaScript navigator properties Supports Client Hints and navigator.userAgentData	Edits both request and response headers, including cookies Filters rules by URL, tab or resource type
Spoofing can break sites that rely on accurate browser detection Does not hide other fingerprinting signals	Only affects traffic from the browser Closed source
Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.