Shortcut to web view of the root of a branch or a specific file on an online origin

I frequently want to share a web-enabled link (eg. github, bitbucket) to a branch or a file in a commit

The file list in the commit has a **context menu -> show in file explorer** 
I would love to have a **context menu -> Show on origin**  that would open in the users default web-browser

The same for the Branch context menu "Create pull request on origin" could have a siblin "View on origin"