[feature] Use extra browser for Browser Steps

[gowtham1337]

Version and OS
v0.49.15 on linux/docker

Is your feature request related to a problem? Please describe.
When I edit the Browser Steps for a watch, my local browser is always used (even if I manually selected an extra browser under Edit Watch > Request

Describe the solution you'd like
A simple drop down to let me choose the browser on the Edit Watch > Browser Steps page would be excellent. This will also let me instantly check the differences between my local browser and the extra browser.

[dgtlmoon]

nice idea

[dgtlmoon]

same could be used for proxies (although proxies i think arent supported by 'extra browser' ?)