Mozilla works on uplifting privacy settings of the Tor browser project to the Firefox web browser to provide privacy conscious users with additional privacy-related options.
While the Tor browser is based on Firefox ESR, it is modified with additional privacy and security settings to protect users of the browser while using the program.
Considering that Tor browser is used by some in critical situations, whistleblowing, publishing news or communication, it is only natural that a stronger focus on privacy and security is necessary.
Mozilla acknowledges these modifications, and plans to integrate some of them in Firefox natively. In fact, the company has already begun to integrate some in Firefox, and plans to integrate others in the future.
Three Tor-specific options landed in Firefox 50 already. Firefox 50 is currently available on the Nightly channel, and it looks as if it is the target milestone right now. As is the case with these improvements, they may be postponed.
Tor-specific privacy settings are often not suitable for Firefox's mainstream audience. That's why you need to enable these settings manually in Firefox before they become available.
A core preference is privacy.resistFingerprinting. Originally introduced in Firefox 41, it is the central preference for Tor-related settings. While it covers most Tor settings that are implemented in the Firefox browser, some are available under other preferences.
Instructions below are for Firefox 50 Nightly.
To block the "open with" option when downloading files, do the following instead
The Tor Uplifting entry on Mozilla Wiki highlights some of the improvements that Mozilla plans to integrate in the future.
Many bugs are not assigned yet, but those that are will protect against system font enumeration or make WebGL fingerprint resistant.
The Tor meta bug lists eight patches that are currently being worked on, and four that are already integrated in Firefox.
Integration of Tor-specific privacy settings and features in Firefox is welcome. These features won't be enabled by default, but they provide privacy-conscious users with better options to harden the browser against browser fingerprinting and identification. (via Sören)
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