Net Tinker Privacy Policy

Last updated: 26 September 2026

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Net Tinker is a browser extension for developers, available for Chrome, Microsoft Edge and Firefox. It intercepts and modifies network requests (mock responses, redirects, headers, delays, and so on) directly in the browser, for development and testing purposes. This policy is the same in all three browsers.

Summary

Net Tinker does not collect, transmit or sell any data to external servers. Everything the extension stores stays in your own browser.

What is stored, and where

• What you create: rules, groups, scenarios and their variants, variables, environments and projects (URL patterns, mock responses, headers, descriptions, tags). Stored locally through the browser's extension storage (storage.local). They never leave your machine unless you export them to a file yourself.
• The trash: the last few things you deleted (at most 10 entries, 1 MB in total), kept locally so a deletion can be undone. Emptying the trash removes them.
• The capture log: only produced in the tab where you manually turn on "Record this tab". It keeps, locally, each request's URL, method, status code and timestamp, and what your rule did to it, capped at the last 200 entries. You can clear it at any time with the "Clear" button. No other tab is captured.
• Values a rule extracts from a response: only for rules where you have explicitly chosen a variable to write into — no rule does this by default. They are kept in the browser's session storage (storage.session), which is memory: they never reach disk, never appear in an exported file, and are gone when you close the browser. You can discard them at any time from the Variables panel.
• Extension preferences (on/off, the tab being recorded, the sites the extension acts on, language, theme): also local, via storage.local.
• A safety copy of your data, taken locally just before an update changes the format it is stored in, so that nothing is lost if the change goes wrong. Each update overwrites the previous copy.

The DevTools panel

Net Tinker adds a panel to the browser's developer tools that lists the network requests of the page you are inspecting. Those captures exist only in memory while the developer tools are open and are never written to storage. A response body is only read when you ask for it — to create a mock from it, search inside it, compare two responses or copy it — and it stays in memory. It is saved only as part of a rule you choose to create.

What we do not do

• We run no servers of our own and send no data to third parties.
• We use no analytics, advertising or tracking of any kind.
• We neither sell nor share information with anyone.
• We do not access your browsing content beyond what is needed to apply the rules you configure yourself.

Why it asks for access to all sites

Net Tinker needs broad host permission (<all_urls>) because its purpose is to intercept network requests on whichever page you decide to create a rule for — there is no way to know in advance which domain that will be. That access is used exclusively to run, in your own browser, the logic of the rules you configure. It is not used to read, collect or send your browsing activity anywhere. You can narrow down the sites the extension acts on from its own settings, or withdraw its access to sites from the browser's extension settings.

Changes to this policy

If this policy changes, the date above will be updated along with the corresponding content, in the same location.

Contact

For any question about this extension's privacy, write to nettinker.support@gmail.com.