Is User-Agent Switcher safe?

User-Agent Switcher writes the configured UA string to each page's localStorage, where any page script can read it.

The extension injects a content script into every page (matching *://*/*) that stores the active user-agent string under the key 'useragent-switcher-uastring' in the visited site's own localStorage. Any JavaScript running on that page can retrieve this value, revealing both that the extension is installed and which user-agent the user has configured. No data is transmitted to external servers; the exposure is local to each page origin.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.