How to quickly change the IP address in the browser?

Question

Browsers

Periodically, you need to visit sites that do not welcome multiple accounts. I have about 10 accounts.
There are 10 quality individual proxies (from different subnets). Now I do this: I
start the virtual machine, I prescribe a proxy in the IE settings.
I launch one of the browsers, clear the cookies. I go to the site, do what is required. And then all over again. I also change the size of the virtual machine window every time.
It's all very boring and tedious. Surely there are some ways/programs to automate this process. To drive in all the proxies once and then switch them. At the same time, so that the cookies are immediately cleared and the user agent is changed (it is possible for a random one). In general, the server should see a completely different client, not like the previous one.
PS At first I tried TOR, but it's slow and unreliable. It is also required that one account always has the same IP address.

Answer 1

Here, take the Sphere browser, it is just tailored for your tasks... Here you can change the torus and the proxy and the country and the time zone and open many tabs with different types of connection...
...and connections

Answer 2

Tor browser, change the chain for this site.

Answer 3

Premium Proxy Switcher . There are many such programs on the web.

Answer 4

I launch one of the browsers, clear cookies

Start a new instance in private mode.
Cookies are automatically empty.
If you need it all the time, you can disable storing the entire history.