why do files downloaded with http and https have the same size? while working with Encryption mostly cipher text is always larger the plain text, why isn't that the case when downloading a file using https ? even that compression isn't much used anymore because if the CRIME and BREACH exploits the file still has the exact same size as a http download.

UPDATE : something i may be thinking of is that the browser or whatever tool only tells you about the size after decryption ?
[After your edit I can confirm that the browser does the whole encryption in the background - you only get the "normal" HTTP connection to see and the downloaded files appear as big as the unencrypted files - even if the encrypted files are only marginally bigger. You don't ever see the encrypted version without some addition work. You can use a secure connection like a normal one.]

Here a explanation why the exchanged data is slightly bigger than with unsecured connections: Ciphertext is mostly only slightly larger than the plaintext, not a significant part if the plaintext is already pretty large. At first (with for example TLS) we create a session which exchanges some data to authenticates the connection and generate a secure session key. This takes not much bytes, maybe a kilobyte. After that only a IV (ca. 16 bytes) and the padding (ca. 1 to 16 bytes) needs to be exchanged - only below ca. 4 percent size increase with 1 kilobyte exchanged plaintext. With bigger file sizes this will be even lower.