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Disabling JavaScript causes many web sites to be unusable, thus it is enabled by default.Īs a best practice, one should disable JavaScript in the Tor browser and keep NoScript enabled for all sites, unless you have an extremely compelling reason not to. Many Tor users are not technically savvy, and JavaScript is commonly used with HTML5 in modern web sites. The only reason the Tor project allows JavaScript to be on by default in the Tor browser is usability. JavaScript), then they may be hard pressed to find a viable exploit even if they have access to zero days etc.

If the vectors for these zero-days are disabled (e.g. the FBI), they have access to zero-day exploits. In the case of a serious adversary like a state-backed entity (e.g. In general, enabling JavaScript opens the surface area for many more potential attacks against a web browser.

You can read more about it in Ars Technica. This caused the computers to call back to an FBI server from their real, non-anonymized IP, leading to the deanonymization of various users. The FBI kept servers online, and then installed javascript paylods which exploited a zero-day exploit in Firefox. The first major incident where this happened was with the "Freedom Hosting" seizure by the FBI. A detailed report can be found here.There are a number of known vulnerabilities, that have been used, to deanonymize Tor users via leveraging JavaScript. This is handled within iOS and cannot be changed by Onion Browser. More information here. OCSP leak: Visiting EV “Green Bar” HTTPS sites may leak information that can be used to reveal the domain name of the website you are visiting. (If you are using a VPN, the VPN IP address is revealed instead.) To defend against this, you may set Strict security mode in Host Settings, which will disable Javascript. This will reveal your real IP address to sites using these features. You should note there are a couple of security advisories on its website: WebRTC/Media leaks: Due to iOS limitations, WebRTC and media files leak outside of Tor and are routed over the normal internet. Naval Research Lab, Tor is a special network that helps people browse the internet with as much privacy as possible. Uncheck the box next to Enable JavaScript. And yes - it is important to disable it, for a host of reasons. When you set it to false it stops any Jscript running. No reason to be scared of editing the config. Or in the url tab put in 'about:config' and search for 'javascript.enabled' and set it to false. Need a Tor browser on iOS? Onion Browser is the only iOS app recommended on the Tor Project’s website. How do I shut off JavaScript Go to the Tools menu. Tor -> Options -> Privacy & Security -> Safest mode.