When I open a pull request I see a view with three tabs; Overview, Diff and Commits. This is great.
When I enter one of the commits to view its content there is no way for me to get back to the particular pull request. We prefer to go through the individual commits during our reviews and we have to click on the pull request menu button on the navigation bar and find our review every time we want to get back.

Could you have a back button for commits if you've entered them during a review to which they belong?