is tor safe if you have other browsers open

In short Tor does more immediately out of the box to protect its users when compared to other browsers, however it will not protect you if you do not follow its advice and instructions as the user it is on you to do and not do certain actions. FBI’s recent takedown of Freedom Hosting (an anonymous web-hosting service running as a hidden service on the Tor network) was possible due to vulnerabilities in the Tor Browser Bundle. Tor even states that it is not recommended to install third party addons as these may aid in compromising Tor by either not correctly using Tor for networking or making your browser stand out amongst the plethora of other Tor users. Tor Browser Bundle should not be used to protect one’s online privacy and security. But Tor does have some vulnerabilities, and as with any browser, Tor users remain vulnerable to online threats, ranging from malware to phishing scams. Tor allows you to completely turn off Javascript either through the Security slider built into Tor, the NoScript addon that lets you whitelist and block individual scripts, or the old fashion and my personal favorite about:config tweaks. The Tor Browser is generally considered safe and secure thanks to onion routing protocol that encrypts your data and hides your IP address.

Tor is based on Firefox which is open source meaning there are tons of contributors aside from the Firefox and Tor teams that report vulnerabilities and help keep the browsers protected and up to date. Let me put it to you this way if I'm going to go through the effort of attacking a browser I'm going to attack either something that affects everyone like malicious Javascript, a bad addon or plugin, or target a specific browser that is widely adopted.

Is tor safe if you have other browsers open