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Not sure how true this is but someone said that when they used the Tor browser while participating in an ICO, they were hacked and lost a lot of Ether. So be wary of using the Tor browser.

That doesn't sound true.

It is, several online wallets were affected by that as well. If i'am not mistaken it was done via "ssl downgrading" which is possible as the tor nodes act as a proxy and the person who controls the proxy can fiddle with your traffic. It is not per se insecure but you definitely need to keep your eyes open.

Thank you @fleuri. That was new and useful info.