https://brendaneich.com/2014/01/trust-but-verify/

" Every major browser today is distributed by an organization within reach of surveillance laws. As the Lavabit case suggests, the government may request that browser vendors secretly inject surveillance code into the browsers they distribute to users. We have no information that any browser vendor has ever received such a directive. However, if that were to happen, the public would likely not find out due to gag orders."