I'm sorry that your screw driver isn't a ratchet, and that your ratchet isn't a hammer.
But have you tried to actually lace up your shoes? They'll work better that way.
Read, learn, and re-configure your browser, your operating system, and your network to actually do whatever it is that you want it to do. Most browsers can easily be configured to limit the number of simultaneous connections. It's a number somewhere -- think registry, about::config, etc. Did you try? No.
You're on something that's both atypical and inferior. So configure it to your preferences.
Also, you could configure your router to limit connection counts. You could configure your browser to access only one domain at a time. You could load your hsts file to block ad servers.
You could choose to block most typical third-party sites when you aren't interested in them -- like blocking facebook would block like buttons everywhere. Unblock it when you want them. Block them when you don't.
You seem to be surprised that the default out-of-the-box isn't for you. Big surprise -- it isn't for anybody. It takes me three days to configure a new machine. There are about ten thousand settings to look configure to my liking. I remap keys on the keyboard, configure macros on the mouse, firewalls and hosts files. Does my browser show image placeholders for still-loading images? Security settings, privacy settings, themes, colours, mouse cursor sizes, the list goes on. Toolbars, a dozen little UI tools, notes and reminders, icons a'plenty, work drive, play drive, system drive, memory limits, processor limits, user permissions.
Your car has another 100 -- radio stations, temperatures, seat positions, steering wheel positions, tire pressures, cargo nets, folding seats, et cetera.
Geez, do you buy photographs that come pre-hung on your walls?
Make a decision on your own for a change.
I've changed my mind. Call me. I'll run through the whole thing with you. You can pay me to configure everything with your usage-scenarios in-mind. I'll happily take your money. And nearly all of it can be done remotely -- I'll need your help for a few boot-time (e.g. BIOS) settings, like boot disks, power management, and power failure recovery settings.