Extend browser engine options with some kind of plugin system

[sadkebab]

I love having browser tabs in my terminal but native webViews on macOS are just painful to use.

For example, in the company I work for we use linear and I tend to open a cmux tab for each linear ticket I am working on and usually one of the tabs is for the Github PR page or for the Github Actions page. Github has a lot of annying bugs like random selects non being clickable in the native web view and that creates so much useless friction when using cmux web tabs.

It would be great if there were options for different engines.
I guess it would make maintainer's lives easier to ship them as plugins so we can customise our cmux experience without cluttering too much the core of the project.