I think there's still something wrong with your setup....
You should be able to have as many Firefox windows and tabs as you'd like without using too much RAM, since they should de "suspended".
I regularly have hundreds of tabs running fine, on 32GB of RAM.
Most likely it's a vscode extension that's leaking memory, and this problem will still happen after your upgrade, just take longer.
I can't modify the contents of other websites embedded as iframes.
The other option would be to make a request in my server and modify the content and then pass that, but then I'd be hosting an unsecured proxy which I don't want to do.
The only good way to do this would be with a browser extension, which I haven't got a clue on how to create. :/
I think there's still something wrong with your setup.... You should be able to have as many Firefox windows and tabs as you'd like without using too much RAM, since they should de "suspended".
I regularly have hundreds of tabs running fine, on 32GB of RAM.
Most likely it's a vscode extension that's leaking memory, and this problem will still happen after your upgrade, just take longer.