Have a look at this extension which forces a higher level of HTTP security on many common websites.    Im not sure how many of those are also crypto websites but it seems a good idea in general --https://www.eff.org/https-everywhere

Its an extension for the browser basically, theres some vetting but decide yourself.    Also another similar type app for browsing that tries to verify websites are legitmate is this one: --https://chrome.google.com/webstore/detail/wot-web-of-trust-website/bhmmomiinigofkjcapegjjndpbikblnp?hl=en

Obviously search rather then use my links if you like.   There is something to be said for having a separate browser just for the serious dealing, or even a separate machine.  Im just mentioning possibly useful info to consider rather then recommending these apps explicitly.  I dont deal anything like the amounts juggled about here so its upto the individual to consider