This question already has an answer here:
I just somehow worry about connecting TBB to the same entry node which may be hacked / surveillenced. Will it be more safe if I used uMatrix add-on in TBB to spoof my network identiies (I also spoof MAC address each time), and then change the first entry node each time? Moreover, how do you suggest to change the first entry node? I just blocked the node IP by my firewall.