How to decrypt binary code? You will answer – in no way. You need to have sources.
The counter question – how to decipher the browsers? If there is a encoder, there is a decoder. True?

Answer 1, Authority 100%

What do you mean by expression “binary code” ? Normal “Binary Code” View:

00110010

is very simply converted by a decimal system using the “degree degree” method =)
So, for example:

00110010 = (0 * 2 ^ 0) + (1 * 2 ^ 1) + (0 * 2 ^ 2) + (0 * 2 ^ 3) + (1 * 2 ^ 4) + (1 * 2 ^ 5) = 0 + 2 + 0 + 0 + 16 + 32 = 50

or, perhaps, do you mean “decoding” of the original browser code, something there? =)

Answer 2, Authority 75%

Probably the author asks that units and noliki from the network cable fall into the browser, and he somehow turns them into text and pictures.

So, the exchange of data is based on specific protocols, with a bunch of checks of the type of checksum, etc., so the browser knows that it is transmitted, and not just interprets some flow 101010 …
Plus there are several different levels in the network architecture.

You need to either read about the network of the network, or do not score this head and work with what you see.

Answer 3

If you look at the tags, you will advide with this article.
Byte Code

and search in Google you need byte-code decompiors