Yes I do mean bad. For those who haven't tried it I'll explain. The default browser has an option which is set to on by default. That option uses tor to browse in private mode. It's easy to turn off but thats not the issue. The issue is users who have no idea are subjectived to attacks

Tor exit nodes (the way you access the internet from the tor network) can be malicious. As a real world example here is an article talking about patching binaries http://www.hotforsecurity.com/blog/tor-exit-node-patches-malware-on-executable-downloads-10690.html. I haven't looked over the details but IIRC VLC isn't signed and IDK if this code cares if binary is signed but you potionally will get malware if you download an exe through a malice tor node.

If you look into what the tor browser does you'll see it has various settings and addons for safety. One big thing is the tor button is disable some addons (like flash) so it doesn't comminicate w/o going through the proxy. Tor button also changes the user agent to a common string to make it more difficult to fingerprinting you (For example it will say I'm using firefox 31 on windows even though I'm on trisquel). It will block 3rd party tracking (cookies and I believe scripts) and from what I hear cleans out supcious javascript. Other addons include noscript (disable javascript) and SSL everywhere (switches to HTTPS on known sites).

The browser in private mode offer none of this. Because it doesn't a user is subjected to binary patching and attacks researchers or malices parties may do. A tor node is ran on a someones private server. They can monitor and modify traffic. It's different from the internet which is generally a connection from you to your ISP to mostly or entirely routers connecting you to your destination (an IP address).

So having a user by default not knowing what tor is or what may happen can potientally be hacked or have extra monitoring on them (fingerprinting or leaking IP address through flash or another addon since they aren't blocked). I suggest not allowing the feature at all or finding a way to enable torbutton and the other addon found in the tor browser when switching to private mode. I also suggest looking at the tor browser setting (about:config).

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