JavaScript és un llenguatge de programació que els webs utilitzen per augmentar els ginys interactius, com els vídeos, animacions, àudio i estats de cronologies. Malauradament, JavaScript és vulnerables a atacs de seguretats, que poden causar la descoberta de l'anonimat.

Tor Browser includes an add-on called NoScript. It's accessible through "Preferences" (or "Options" on Windows) on the hamburger menu (≡), then select 'Customize' and drag the "S" icon to the top-right of the window. NoScript allows you to control the JavaScript (and other scripts) that runs on individual web pages, or block it entirely.

Users who require a high degree of security in their web browsing should set Tor Browser's Security Level to "Safer" (which disables JavaScript for non-HTTPS websites) or "Safest" (which does so for all websites). However, disabling JavaScript will prevent many websites from displaying correctly, so Tor Browser's default setting is to allow all websites to run scripts in "Standard" mode.


El navegador Tor està basat amb Firefox, i tots els complements i temes compatibles amb Firefox poden ser instal·lats al navegador Tor.

Tanmateix, els únics complements que s'han testejat pel Navegador Tor són els inclosos per defecte. La instal·lació d'altres complements pot causar greus problemes que afectin la seguretat i la privacitat. És altament recomanat no instal·lar complements, ja que tampoc gaudeixen de suport per part del Projecte Tor.


Flash was a multimedia software used by websites to display video and other interactive elements such as games. It was disabled by default in Tor Browser because it could have revealed your real location and IP address. Tor Browser no longer supports Flash and cannot be enabled.

The majority of Flash's functionalities have been substituted by the HTML5 standard, which heavily depends on JavaScript. Video platforms such as YouTube and Vimeo have transitioned to HTML5 and no longer utilize Flash.