CLI: Option to choose which browser to open

[muuvmuuv]

I'm using Firefox Developer Edition as my primary developing browser and when I do the docusaurus-start it opens my Firefox for private use only.
It would be nice to have somewhere an option to set the browser/browser path of choice.

[endiliey]

In v1 it is based on react-dev-utils openBrowser
So you might want to set process.env.BROWSER;

[yangshun]

Just tested using process.env.BROWSER in the CLI via

$ BROWSER=firefox npm start

and it indeed opened up in Firefox. Docusarus wouldn't need to implement this, instead we could add this tip to the documentation instead. This task is up for grabs!