Welcome to Mustang
Mustang Privacy Notice

This Mustang Privacy Notice describes the privacy practices that are specific to the Mustang browser.

Not all of the features discussed in this Privacy Notice appear in all Mustang products. To keep things simple, however, we’re going to use the term "Mustang" on its own to refer to each of the products within the Mustang family. Where an individual Mustang product works in a different way we’ll be sure to highlight that.

For early adopters who want to test features that are still under development, we make available preview versions (also known as beta, dev and canary) of Mustang browser in addition to the stable version. Although this Mustang Privacy Notice applies to the stable and preview versions, it may not be fully up to date when describing features still under development in the preview versions.

  • Information receives when you use Mustang

    You do not need to provide any personally identifying information in order to use Mustang.

    When you use any browser, including Mustang, to contact Rafotech's servers, by default Rafotech receives standard log information including your system’s IP address and one or more cookies. You can configure Mustang browser to not accept cookies from or other sites.

    • If you use the Multiple Users feature of Mustang browser, you can set up personalized copies of Mustang browser for users who are sharing the same computing device. It isn’t intended to secure your data against other people using your device - so anyone with access to your device can view all the information in all profiles. To truly protect your data from being seen by others, use the built-in user accounts in your operating system.
    • If you choose a search engine, Mustang will contact when it starts or when you change networks so as to determine the best local web address to send search queries. When you type URLs or queries in the Mustang address bar (omnibox) or App Launcher search box, the letters you type may be sent to your default search engine so that the search engine’s prediction feature can automatically recommend terms or URLs you may be looking for. If you accept a predicted query or URL, Mustang may send that information from the browser to your default search engine as well. Learn more about disabling server predictions in the omnibox and 's logging policies for omnibox predictions.
    • If you grant an application, extension, or website permission to use ’s Cloud Messaging, or if you use Mustang Sync, Mustang generates a randomly chosen device ID. This device ID is shared with but not accessible to third parties, and is revoked once it is no longer in use or when the Mustang profile is removed. From the device ID, Mustang then derives a registration ID that is shared with applications, extensions, or websites to securely pass messages from ’s servers to the browser.
    • If you use Mustang’s location feature, which allows you to share your location with a web site, Mustang will send local network information to Location Services to get an estimated location. Learn more about Location Services and enabling / disabling location features within Mustang. The local network information may include (depending on the capabilities of your device) information about the wifi routers closest to you, cell IDs of the cell towers closest to you, the strength of your wifi or cell signal, and the IP address that is currently assigned to your device. We use the information to process the location request and to operate, support, and improve the overall quality of Mustang and Location Services. The collected information described above will be anonymized and aggregated before being used by to develop new features or products and services, or to improve the overall quality of any of ’s other products and services.
    • If you attempt to connect to a website using a secure connection, and the browser blocks the connection due to information that indicates you are being actively attacked by someone on the network (a "man in the middle attack"), Mustang may send information about that connection to for the purpose of helping to determine the extent of the attack and how the attack functions.
    • For Mustang, you may choose to send usage statistics and crash reports to Rafotech. You can manage this setting within the Mustang preferences page. This setting will apply to all users for a given installation of Mustang. The usage statistics and crash reports help us diagnose problems, help us understand how users interact with Mustang, and help us improve Mustang's performance.
    • Mustang tries to avoid sending information that identifies you personally. Crash reports, however, can contain system information at the time of a malfunction, and errors leading up to a malfunction. We may share with third parties certain aggregated, non-personal information we derive from our analysis, such as how frequently certain types of crashes occur.

  • Information website operators receive when you visit a site using Mustang

    Sites that you visit using Mustang will automatically receive standard log information similar to that received by Rafotech’s servers. These sites may also set their own cookies or store site data on your system. You can restrict cookies and other site data in Mustang's preferences page.

    If Mustang’s network actions prediction features are enabled, Mustang may look up the IP addresses of all links on webpages and open network connections to load webpages faster. Sites can also use pre-rendering technology to pre-load the links that you might click next.

    If you use Mustang in incognito mode or guest mode, it will not transmit any pre-existing cookies to sites that you visit. Sites may deposit new cookies on your system while you are in these modes; these cookies will only be temporarily stored and transmitted to sites while you remain in incognito / guest mode. They will be deleted when you close the browser, close all open incognito windows or exit guest mode.

    If you choose to use Mustang’s location feature, this service allows you to share your location with a site. Mustang will not allow a site to access your location without your permission. does not have control over third party websites or their privacy practices. Please carefully consider any website’s privacy practices before consenting to share your location with that website.

  • Information stored on your system when you use Mustang

    Mustang stores some information locally on your system. This may include:

    • Basic browsing history information, for example the URLs of pages that you visit, a cache file of text and images from those pages, and a list of some IP addresses linked from pages that you visit.
    • A searchable index of most pages you visit (except for secure pages with "https" web addresses, such as some bank pages).
    • Cookies or web storage data deposited on your system by websites you visit.
    • Locally-stored data saved by Add-ons
    • A record of downloads you have made from websites

    You can always choose to delete your browsing history information, in whole or in part.

    You can also limit the information Mustang stores on your system by using incognito mode or guest mode. The Mustang browser offers both modes. Incognito mode is useful if you would still like to have access to information from your existing profile, such as suggestions based on your browsing history, while you are browsing. Guest mode is useful if you would prefer to begin a browsing session without seeing information from any existing profiles. In either of these modes, Mustang will not store basic browsing history information such as URLs, cached page text, or IP addresses of pages linked from the websites you visit. It will also not store snapshots of pages that you visit or keep a record of your downloads (although this information could still be stored elsewhere on your system, e.g. in a list of recently opened files). New cookies received in these modes will not be saved after you close your browser, close all open incognito windows or exit guest mode. You can see when you are in incognito / guest mode because the incognito icon appears in the top corner of your browser; in some cases the border of your browser window may also change color.

    When you make changes to your browser configuration, such as by bookmarking a web page or changing your settings, this information is also saved. These changes are not affected by incognito / guest mode.

  • Unique Identifiers for Digital Rights Management

    In order to allow certain content to be accessed using Mustang browser for Windows, Mustang may be required to provide selected content partners and websites using Adobe Flash Access with a unique identifier that is stored on your system. You can disable this feature in the settings or reset the unique identifier’s value by reinstalling the operating system.

    Parties to whom your unique identifier is provided could associate it with personally-identifiable information you provide to them. ’s use of a unique identifier to provide content from servers is subject to the Privacy Policy. If you are accessing content from a third party service, you should review those parties’ privacy policies to learn more.

  • Using apps, extensions, themes, services, and other add-ons with Mustang

    You may use apps, extensions, themes, services and other add-ons ("Add-ons") with Mustang, including some that may be pre-installed or integrated with Mustang and some that you may obtain from Mustang Web Store or other sources.

    Before installing an Add-on, you should review the requested permissions. Add-ons may be designed to store, access, and share data stored locally or in your Drive account. Add-ons may use notifications that are sent through servers. Mustang may check for, download, and install updates to your Add-ons. Mustang may send usage indicators to for installed Add-ons. Some add-ons might require access to a unique identifier for digital rights management or for delivery of push messaging. You can disable the use of such an identifier by removing the add-on from Mustang.

    From time to time, may discover an Add-on that poses a security vulnerability or violates the developer terms for Mustang Web Store or other legal agreements, laws, regulations or policies. Mustang may periodically download a list of such Add-ons from ’s servers, and may remotely disable or remove such Add-ons from user systems in its sole discretion.

    Add-ons developed and provided by may communicate with servers and are subject to the Privacy Policy unless otherwise indicated. Add-ons developed and provided by third parties are the responsibility of such third parties and may be subject to third party privacy.

  • Uses

    Information that receives when you use Mustang is processed in order to operate and improve Mustang and other services. Information that other website operators receive is subject to the privacy policies of those websites. Mustang stores information on your system in order to improve Mustang’s performance and to provide you with useful features and services.

  • More information

    Mustang adheres to the US Safe Harbor privacy principles. For more information about the Safe Harbor framework or our registration, see the Department of Commerce's web site.