MessageMediator extension: privacy policy
Effective October 15, 2026. Applies to the MessageMediator browser extension for Chrome and Edge.
The short version
- Nothing you type leaves your browser until you click Revise. Underlining happens entirely on your device.
- When you click Revise, only that one paragraph and the options you picked are sent to MessageMediator, over HTTPS, to be revised.
- We do not store your text. It is processed in memory and discarded. We keep only counts (how many revisions you used today, and model usage totals) for your quota and our costs.
- We never sell or share your data, never use it for advertising, and never use it to train AI models.
- We never read password, payment, one-time-code or similar fields, and banking and health sites are off by default.
What the extension can see
To underline your writing, the extension runs on the pages you visit and looks at text fields you type into. That text stays on your device. It is not recorded, logged or sent anywhere while you type.
What is sent, and when
Only when you click Revise on a paragraph: that paragraph's text and your choices (more formal, more polite, more concise), together with your extension sign-in token. The page address, the rest of the field, and other paragraphs are not sent.
Who processes it
MessageMediator (our servers on Cloudflare) and the AI model provider that produces the revision (Anthropic's Claude, through our AI gateway; a Cloudflare Workers AI model is a disclosed backup). Providers process the paragraph only to return the revision, under terms that do not allow training on it.
Your account
Signing in links the extension to your MessageMediator account with a token stored in the extension. Signing out deletes it on our side. Your account data is covered by the MessageMediator privacy policy.
Stored on your device
Your on/off settings, the sites you turned off, and the sign-in token, in the browser's extension storage. Uninstalling the extension removes them.
Permissions
- Read and change data on websites: needed to underline text fields and to replace a paragraph when you click Revise. Used only for that.
- Storage: your settings.
Children
The extension follows the same age rules as MessageMediator accounts.
Contact
Questions or deletion requests: contact us.