How to change the transmitted browser data?

Question

Browsers

Hello
Are there any possibilities in any browser of this kind?
- When visiting sites, send them the information I set about the client (language, browser version, extensions, graph map, etc.)
- Save a separate cache with cookie data for each open version of the browser (or tab)
- Parallel launch of several browser processes with different proxy settings

Answer 1

Yes, there are opportunities,
look for antidetect browsers, there are many different ones and everything you need is implemented in them

Answer 2

Use profiles
example for firefox:
firefox -no-remote -profile "path to profile directory"