How store fingerprints work in Merca

Merca saves device fingerprint settings per store and applies them in the corresponding browser window. Stores on the same computer can present different environment parameters.

CPU and memory settings are randomized for each new store or reset. Once saved, later launches reuse those values. You can also adjust them manually.

WebRTC defaults to Restrict UDP. Choose a connection mode in its separate card. UDP-enabled modes may expose direct IP addresses; close and relaunch the browser after changes.

Browser version defaults to Automatic, which selects the highest available version matching the engine's major version. You can also choose a version manually.

Speech voices offers No override, Full override (default), and Append Google voices only. Font allowlist offers No override or Full override (default), using the preset list for the host system. Relaunch the browser after changes.

Canvas 2D noise is enabled by default and can be turned off under Fingerprint. It only controls pixel noise in readback and image exports from regular and offscreen Canvas 2D contexts, without affecting WebGL, WebGPU, or other noise. Relaunch the browser after changes.

Follow How to add a store, add two stores, then Launch each one. Open the same fingerprint checker in both windows to compare environment parameters. The screenshots below show two example stores:

A store reuses its saved fingerprint configuration unless you change the settings. Timezone and language use node information; when the node has no timezone, the current computer's timezone is used. Stores with nodes in the same region may share field values. Separate browser configurations do not guarantee that a platform will treat accounts as unrelated.