Do Web browsers use different port numbers for open tabs?

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I'm wondering how browsers internally works. Now, connecting to different Web sites using 'Tabs' within the same browser can be handled in one of two ways: 1 - Using threads 2 - Using Different Source Port Numbers for each open tab

I know there might not be a single answer for this question, and it might differ from one browser to another, however all responses are appreciated.

Thanks

Thanks for everyone.I really appreciate that. My question relates to the Source Port at the client side. I'm asking if the browser uses different source ports for each tab it opens, or the same source port for the entire process 'I mean window that includes different tabs', or the same source port for the entire windows?

Or, do web browsers use threads?

port tabs multithreading browser
6 Answers

Copied from Cisco CCNA course:

For instance, assume a host is initiating a web page request from a web server. When the host initiates the web page request, the source port number is dynamically generated by the host to uniquely identify the conversation. Each request generated by a host will use a different dynamically created source port number. This process allows multiple conversations to occur simultaneously.

In the request, the destination port number is what identifies the type of service being requested of the destination web server.. For example, when a client specifies port 80 in the destination port, the server that receives the message knows that web services are being requested.

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