It doesn't make sense to me to use three or four different browsers. That means three or four installations (at a minimum, if all goes right), three or four configurations, and three or four sets of processes eating up RAM.
Many browsers allow you to start multiple instances. For example, I install and configure just one browser on my computers, but I run as many as three instances of that one browser, with each instance in its own workspace (and I could run more, but three are actually all I need, so far).
Vivaldi, for instance, presents this context menu on a right-click to any Vivaldi icon in the Task Manager:
By then clicking on the New Window button, I can put a new instance of Vivaldi in the empty workspace I've previously selected. In all I have three workspaces where an instance of Vivaldi runs on my laptop... one for financial matters, one for the Solus forum and related sites, and one for miscellaneous browsing, such as online shopping.
The same extension (LastPass) is used by each instance, as are all the same settings, and I've needed to do only one installation and configuration. And I needed to learn well only one browser's secrets and idiosyncrasies.
