Firefox/User Agent

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Draft-template-image.png THIS PAGE IS A WORKING DRAFT Pencil-emoji U270F-gray.png
The page may be difficult to navigate, and some information on its subject might be incomplete and/or evolving rapidly.
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This page gives details of the Firefox user agent we are working towards.


The UA will be the same on all channels.


 Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/13.0 Firefox/13.0



Like the Mobile Firefox User Agent string, we are trying to balance backward compatibility, brevity, truthfulness, forward compatibility, footgun avoidance and fingerprint resistance. However, with an installed base of 400 million users, compatibility is a greater concern than with Mobile Firefox.

Recent changes have involved removing redundant and fingerprintable parts of the UA string, such as the browser language and the "U" security identifier.

<to be continued>