It is impossible to verify the integrity of a TailsUSB stick or DVD while running Tails from it. It would be like asking to someone whether they are lying: a true liar would always pretend to tell the truth.
Tor Browser also includes a [[security level|doc/anonymous_internet/Tor_browser#security-level]] and the [[NoScript|doc/anonymous_internet/Tor_browser#noscript]] extension to optionally disable more JavaScript. This might improve security in some cases. However, if you disable JavaScript, then the [[fingerprint|doc/anonymous_internet/Tor_Browser#fingerprint]] of your *Tor Browser* differs from most users. This reduces your anonymity.
<div class="next"> <ul> <li>[[Browsing the web with <span class="application">Tor Browser</span>|doc/anonymous_internet/Tor_browser]]</li> </ul> </div>
As explained in our documentation about [[the fingerprint of *Tor Browser* in Tails|doc/anonymous_internet/Tor_Browser#fingerprint]], Tails provides anonymity by making it difficult to distinguish a particular user amongst all the users of <span class="application">Tor Browser</span> (either in Tails or on other operating systems).
This second synchronization is made by sending HTTPS queries through Tor to several websites and deducing a correct time from their answers. You can see the list of websites that Tails can connect to in *[[!tails_gitweb config/chroot_local-includes/etc/default/htpdate.pools desc="/etc/default/htpdate.pools"]]*.